Drain valve

Abstract

The application provides a drain valve, which comprises a valve body, a valve core component, a first driving member and a second driving member, wherein the valve body comprises a flow passage, a first opening and a first mounting hole in sequence, the first mounting hole is located outside the flow passage, the valve core component is movably arranged in the flow passage, a blocking part of the valve core component can block or open the first opening, the first driving member and the second driving member are arranged in the flow passage and the first mounting hole respectively, the first driving member and the second driving member are respectively in driving connection with the valve core component, the first driving member and the second driving member are respectively located on both sides of the blocking part along the moving direction of the valve core component, the first driving member can sense the temperature in the flow passage, and the second driving member can sense the temperature at the first mounting hole; wherein the first driving member can be elongated or shortened with the change of the temperature, the second driving member can be elongated or shortened with the change of the temperature, and the first driving member and the second driving member cooperate to drive the valve core component to move, so that the blocking part blocks or opens the first opening.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to a drain valve. BACKGROUND

[0002] The drain valve generally comprises a valve body, a valve core component and a driving member, wherein the valve body is provided with an opening and a flow passage in communication with each other, an end of the valve core component is provided correspondingly with the opening, and the valve core component is movably arranged in the flow passage to block or open the opening. The driving member is arranged in the flow passage, and can be deformed and drive the valve core component to move to open or close the opening with the change of temperature. Specifically, when the temperature of the fluid decreases to the temperature close to freezing, the driving member is deformed and drives the valve core component to move to open the opening, so as to prevent the drain valve from being frozen and cracked.

[0003] The driving member is arranged in the flow passage, and can only sense the temperature of the fluid in the flow passage. When the ambient temperature is not lower than the freezing temperature of the fluid, and the temperature of the fluid is close to the freezing temperature, the anti-freezing valve opening is not needed at this time. However, by using the above scheme, since the driving member has sensed that the temperature of the fluid is close to the freezing temperature, the driving member will be deformed at this time. After the driving member is deformed, the driving member will drive the valve core component to move and open the opening, and there is a risk of accidental opening of the valve. SUMMARY

[0004] The present application 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 temperature of the fluid is close to the freezing temperature, the drain valve may have a risk of accidental opening of the valve.

[0005] The present application provides a drain valve, which comprises a valve body, a valve core component, a first driving member and a second driving member. The valve body comprises a flow passage, a first opening and a first mounting port. The first mounting port is located outside the flow passage, and two ends of the first opening are in communication with the flow passage and the first mounting port, respectively. The valve core component is movably arranged in the flow passage, and has a blocking part corresponding to the first opening. The blocking part can block or open the first opening. The first driving member and the second driving member are arranged in the flow passage and the first mounting port, respectively. The first driving member and the second driving member are drivingly connected with the valve core component, respectively. Along the moving direction of the valve core component, the first driving member and the second driving member are located on the two sides of the blocking part, respectively. The first driving member can sense the temperature in the flow passage, and the second driving member can sense the temperature at the first mounting port. The first driving member can be elongated or shortened with the change of temperature, and the second driving member can be elongated or shortened with the change of temperature. The first driving member and the second driving member cooperate to drive the valve core component to move, so that the blocking part blocks or opens the first opening.

[0006] Further, when the temperature in the flow passage 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 is elongated and the second driving member is shortened, and the first driving member and the second driving member drive the blocking part to open the first opening; or when the temperature in the flow passage 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 is shortened and the second driving member is elongated, and the first driving member and the second driving member drive the blocking part to open the first opening.

[0007] Further, when the temperature in the flow passage 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 is elongated and the second driving member is shortened, and the first driving member and the second driving member drive the blocking part to open the first opening; or when the temperature in the flow passage 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 is shortened and the second driving member is elongated, and the first driving member and the second driving member drive the blocking part to open the first opening.

[0008] Further, the drain valve further comprises a guide member located in the first mounting port, the guide member is arranged between the second driving member and the valve body, and the guide member can be guided in cooperation with the second driving member.

[0009] Further, the guide member comprises a guide part and a connecting part connected with each other, the guide part is sleeved on the outer side of the second driving member and guided in cooperation with the second driving member, the connecting part is located at one end of the second driving member close to the valve core part, the connecting part comprises a first connecting end and a second connecting end oppositely arranged along the axis direction of the guide part, the first connecting end is connected with the guide part, and the second connecting end abuts against the valve core part, and one end of the second driving member close to the valve core part is connected with at least one of the guide part and the connecting part.

[0010] Further, the second connecting end is connected with the end surface of the blocking part, and the drain valve further comprises a positioning structure arranged between the blocking part and the second connecting end, the positioning structure is used to limit the position between the second connecting end and the end surface of the blocking part of the valve core part.

[0011] Further, along the axis direction of the first mounting port, first and second limiting parts are arranged at intervals in the first mounting port, the guide member is located between the first and second limiting parts, and the two ends of the guide member can be respectively limited in cooperation with the first and second limiting parts to limit the movement stroke of the guide member.

[0012] Further, the first mounting port is coaxially arranged with the first opening, and the diameter of the first mounting port is greater than the diameter of the first opening, the end surface of the one end of the first mounting port connected with the first opening forms the first limiting part; the drain valve further comprises a gasket, the gasket is arranged at the one end of the first mounting port away from the first opening, and the gasket forms the second limiting part; wherein the end surface of the one end of the first mounting port connected with the first opening is limited in cooperation with the end surface of one end of the guide member, and the gasket is limited in cooperation with the end surface of the other end of the guide member.

[0013] Further, the valve body comprises a body part provided with a flow passage, and a second mounting opening is further arranged on the body part and communicates with the flow passage; and a valve seat is arranged at the second mounting opening and provided with a first opening and a first mounting opening which communicate with each other, and the first opening communicates with the flow passage.

[0014] Further, the first opening is arranged on a side wall of the flow passage, and a second opening is further arranged on the valve body and arranged on the side wall of the flow passage, and the second opening is arranged opposite to the first opening, and an end of the valve core part away from the plugging part is arranged corresponding to the second opening.

[0015] According to the technical scheme of the present application, the lengths of the first driving member and the second driving member can change with temperature, and the first driving member and the second driving member are arranged in the flow passage and at the first mounting opening outside the flow passage respectively, so that the situation of opening the valve when the ambient temperature is low but the fluid temperature is high can be reduced, and the situation of opening the valve when the fluid temperature is low but the ambient temperature is high can also be reduced, i.e. the situation of accidental drainage can be reduced. Specifically, when the first opening is in the plugging state, the fluid passes through the flow passage, the first driving member senses the temperature of the fluid in the flow passage, and the second driving member senses the ambient temperature at the first mounting opening, and 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 are elongated or shortened to realize opening 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, the elastic force of the first driving member changes, and the elastic force of the second driving member does not change; similarly, only when the ambient temperature is lower than the second preset temperature but the fluid temperature in the flow passage is not lower than the first preset temperature, 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 is not enough to move the valve core part, i.e. the first opening is still in the closed state, and the situation of accidental drainage is reduced or avoided. In the traditional technical scheme, no matter how the ambient temperature is, as long as the fluid temperature is lower than the opening temperature, the driving member arranged in the flow passage drives the valve core part to move, and the situation of accidental drainage is prone to occur. The present scheme is arranged so that the first driving member and the second driving member sense the temperature of the fluid in the flow passage and the ambient temperature respectively, and only when the fluid temperature in the flow passage 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 simultaneously, and at this time the first driving member and the second driving member can deform simultaneously to drive the valve core part to move. Only when the first driving member or the second driving member deforms, the valve core part does not move, so as to reduce the risk of accidental opening. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the application, and are incorporated in and constitute a part of this specification. The embodiments of the application, together with their

[0017] Figure 1 Fig. 1 shows a structural schematic view of the drainage valve provided by the first embodiment of the present application in a closed state;

[0018] Figure 2 Fig. 2 shows a structural schematic view of the drainage valve provided by the first embodiment of the present application in an open state;

[0019] Figure 3 Fig. 3 shows a structural schematic view of the valve body of the drainage valve provided by the first embodiment of the present application;

[0020] Figure 4 Fig. 4 shows a sectional view of the drainage valve provided by the first embodiment of the present application in a closed state;

[0021] Figure 5 Fig. 5 shows a sectional view of the drainage valve provided by the first embodiment of the present application in an open state;

[0022] Figure 6 Fig. 6 shows a structural schematic view of the guiding member provided by the first embodiment of the present application; Figure 5

[0023] Figure 7 Fig. 7 shows a sectional view of the guiding member provided by the first embodiment of the present application;

[0024] Figure 8 Fig. 8 shows a top view of the guiding member provided by the first embodiment of the present application;

[0025] Figure 9 Fig. 9 shows a structural schematic view of the cooperation between the valve core component and the first driving member provided by the first embodiment of the present application;

[0026] Figure 10 Fig. 10 shows a structural schematic view of the cooperation between the valve core component and the second driving member provided by the first embodiment of the present application;

[0027] Figure 11 Fig. 11 shows a structural schematic view of the drainage valve provided by the second embodiment of the present application in a closed state;

[0028] Figure 12 Fig. 12 shows a structural schematic view of the drainage valve provided by the second embodiment of the present application in an open state.

[0029] In the above drawings, the following reference signs are used:

[0030] 10, valve body;

[0031] ​101, flow passage; 102, first opening; 103, first mounting port; 104, second opening;

[0032] 11, body part; 1101, second mounting port; 1102, second avoiding groove;

[0033] 12, valve seat; 121, first avoiding groove;

[0034] 20, valve core part;

[0035] 21, blocking part; 22, valve rod;

[0036] 30, first driving part; 31, first guide section; 32, second guide section;

[0037] 40, second driving part;

[0038] 50, guide part;

[0039] 51, guide section;

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

[0041] 60, positioning structure;

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

[0043] 71, first limiting part; 72, second limiting part. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without any creative work, are within the scope of protection of the present application.

[0045] As Figures 1 to 10As shown, the embodiment one of the present application provides a drain valve, which comprises a valve body 10, a valve core component 20, a first driving member 30 and a second driving member 40. The valve body 10 comprises a flow passage 101, a first opening 102 and a first mounting port 103, the first mounting port 103 is located outside the flow passage 101, and two ends of the first opening 102 respectively communicate with the flow passage 101 and the first mounting port 103. The valve core component 20 is movably arranged in the flow passage 101, and the valve core component 20 has a blocking part 21, the blocking part 21 is arranged corresponding to the first opening 102, and the blocking part 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 flow passage 101 and the first mounting port 103, and the first driving member 30 and the second driving member 40 are respectively drivingly connected with the valve core component 20, 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 part 21, the first driving member 30 can sense the temperature in the flow passage 101, and the second driving member 40 can sense the temperature at the first mounting port 103; wherein the first driving member 30 can be elongated or shortened with the change of temperature, the second driving member 40 can be elongated or shortened 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 part 21 blocks or opens the first opening 102.

[0046] The length of the first driving member 30 and the second driving member 40 can change with the temperature change, the first driving member 30 and the second driving member 40 are arranged in the flow passage 101 and at the first mounting port 103 outside the flow passage 101 respectively, the situation of opening the valve when the ambient temperature is low but the fluid temperature is high can be reduced, and the situation of opening the valve when the fluid temperature is low but the ambient temperature is high can be reduced, that is, the situation of accidental drainage can be reduced. Specifically, when the first opening 102 is in the closed state, the fluid passes through the flow passage 101, the first driving member 30 senses the temperature of the fluid in the flow passage 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 are elongated or shortened to realize the opening of 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 does not change. Similarly, only when the ambient temperature is lower than the second preset temperature but the fluid temperature in the flow passage 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 is not enough to move the valve core component 20, that is, the first opening 102 is still in the closed state, and the situation of accidental drainage is reduced or avoided. In the traditional technical solution, no matter how the ambient temperature is, as long as the temperature of the fluid is lower than the opening temperature, the driving member arranged in the flow passage drives the valve core component to move, and the situation of accidental drainage is prone to occur. The arrangement of the present solution makes the first driving member 30 and the second driving member 40 sense the temperature of the fluid in the flow passage 101 and the ambient temperature respectively, and only when the temperature of the fluid in the flow passage 101 is lower than the first preset temperature and the ambient temperature is lower than the second preset temperature, the elastic force of the first driving member 30 and the second driving member 40 changes simultaneously, and at this time the first driving member 30 and the second driving member 40 can deform simultaneously to drive the valve core component 20 to move. Only when the first driving member 30 or the second driving member 40 deforms, the valve core component 20 does not move, so as to reduce the risk of accidental opening of the valve.

[0047] The present 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. The first driving member 30 and the second driving member 40 can be made of temperature sensing material, which can be a temperature bag or a memory alloy material. In the 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] As Figures 3 to 5As shown, specifically, when the temperature in the flow passage 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 is shortened, and the second driving member 40 is elongated, the first driving member 30 and the second driving member 40 drive the blocking part 21 to open the first opening 102. In this scheme, the first preset temperature and the second preset temperature are the same. When the valve core component 20 opens the first opening 102, the blocking part 21 of the valve core component 20 moves towards the inside of the flow passage 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 flow passage 101 and the ambient temperature at the first mounting port 103 are both reduced to below 3°C, the elastic force of the first memory alloy spring decreases, the first memory alloy spring is shortened, the elastic force of the second memory alloy spring increases, and the second memory alloy spring is elongated to achieve valve opening.

[0051] When the fluid temperature in the flow passage 101 and the ambient temperature at the first mounting port 103 are both not lower than 3°C, the elastic force of the first memory alloy spring increases, the first memory alloy spring is elongated, the elastic force of the second memory alloy spring becomes smaller, and the second memory alloy spring is shortened to achieve valve closing.

[0052] Further, when the temperature in the flow passage 101 is below 3°C, and the temperature at the first mounting 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 flow passage 101 is not lower than 3°C, and the temperature at the first mounting 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, at this time the actual use working condition is local low-temperature water appearing in summer refrigeration, but the ambient temperature is high, and there is no risk of freezing, and it is not desired to open the drain valve in actual use. At this time, the elastic force of the first memory alloy spring becomes smaller, but since the temperature at the first mounting port 103 is not lower than 3°C, the elastic force of the second memory alloy spring does not become larger, and is still in a small elastic state, and the elastic force of the first memory alloy spring can be ensured to be still larger than that of the second memory alloy spring when designed, so that it can be ensured that the valve core component 20 remains stationary at this time, and the valve core component 20 remains in the valve closing state at this time, and no accidental drainage occurs.

[0054] When the fluid temperature is still 3°C or higher, but the ambient temperature is below 3°C, it is undesirable for the drain valve to open in actual use. At this time, the first memory alloy spring is still in an extended state, maintaining a large elastic force. When the ambient 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 state of greater elastic force. In the design, it can be ensured that the elastic force of the first memory alloy spring and the elastic force of the second memory alloy spring are equal, or the force of the first memory alloy spring is slightly greater than that of the second memory alloy spring, so that the first opening 102 will not open at this time.

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

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

[0057] If water at a temperature not lower than 3°C is introduced into a low-temperature environment, the first opening 102 will initially be open. When the water flows through the first and second shape memory alloy springs, the force of the second shape memory alloy spring decreases, while the force of the first shape memory alloy spring increases. Since the force of the second shape memory alloy spring is less than that of the first, the second shape memory alloy spring shortens and the first shape memory alloy spring extends, thus closing the valve. Therefore, the valve closing logic satisfies the actual operating conditions.

[0058] like Figures 3 to 5 As shown, the drain valve further includes a guide member 50. The guide member 50 is located within the first mounting port 103 and is positioned between the second drive member 40 and the valve body 10. The guide member 50 can guide and cooperate with the second drive member 40. The guide member 50 guides the extension and retraction of the second drive member 40, improving the smoothness and stability of the extension and retraction process, enhancing the stability of the second drive member 40 in driving the valve core component 20, and thus improving the stability when opening the first opening 102.

[0059] like Figures 4 to 9As shown, specifically, the guide member 50 includes a guide portion 51 and a connecting portion 52 connected with each other, the guide portion 51 is sleeved on the outer side of the second driving member 40 and is in guiding cooperation with the second driving member 40, the connecting portion 52 is located at the end of the second driving member 40 close to the spool component 20, the connecting portion 52 includes a first connecting end 521 and a second connecting end 522 oppositely arranged along the axial direction of the guide portion 51, the first connecting end 521 is connected with the guide portion 51, and the second connecting end 522 is in abutment with the spool component 20. The end of the second driving member 40 close to the spool component 20 is connected with at least one of the guide portion 51 and the connecting portion 52. In the embodiment, the above arrangement enables the spool 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 condition to ensure the spring force of the second memory alloy spring.

[0060] In the embodiment, the connecting portion 52 includes a connecting rod and a connecting plate connected in sequence along the axial direction, the connecting plate forms the first connecting end 521, and the connecting rod forms the 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 in a circular plate structure, the connecting plate is perpendicular to the connecting rod, and the end of the connecting plate close to the second memory alloy spring is connected with the connecting rod, and the connecting plate is connected with the inner side wall of the guide portion 51. A plurality of flow-through holes are arranged on the connecting plate, the plurality of flow-through holes are annularly and spaced apart along the circumference of the connecting rod, and the total flow-through area of the plurality of flow-through holes is greater than the flow-through area of the first opening 102 to avoid throttling and ensure the smoothness of fluid discharge.

[0061] Further, in the embodiment, the end face of the end of the second memory alloy spring close to the connecting plate is in abutment with the end face of the end of the connecting plate close to the second memory alloy spring. In this way, the contact area between the second memory alloy spring and the guide member 50 can be ensured, and the stability of the abutment between the memory alloy spring and the connecting plate is further improved.

[0062] In the embodiment, when the spool component 20 opens the first opening, the blocking portion 21 moves towards the direction of the flow-through passage 101, the end of the connecting rod away from the connecting plate is in abutment with the end face 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 of the connecting rod away from the connecting plate protrudes from the end face of the end of the guide portion 51 close to the spool component 20. In this way, when the spool 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 spool component 20 during the movement of the spool component 20.

[0063] Further, the drain valve further comprises a positioning structure 60. The positioning structure 60 is arranged between the blocking part 21 and the second connecting end 522, and is used to limit the position between the second connecting end 522 and the end face of the blocking part 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 part 21. The specific form of the positioning structure 60 is not limited in the scheme.

[0064] In the embodiment, the positioning structure 60 comprises a positioning groove 61 arranged on the end face of the blocking part 21 and a positioning protrusion 62 formed by the hemispherical structure of the end of the connecting rod away from the connecting plate. The positioning protrusion 62 is positioned and matched with the positioning groove 61. The above arrangement has the advantages of simple structure, easy processing, and reduced wear between the connecting rod and the blocking part 21, thereby ensuring the service life of the connecting rod and the blocking part 21.

[0065] As shown in Figure 3 and Figure 4 Further, the first mounting port 103 is provided with a first limiting part 71 and a second limiting part 72 which are spaced apart along the axis direction of the first mounting port 103. The guide piece 50 is located between the first limiting part 71 and the second limiting part 72. The guide piece 50 has a first limit position and a second limit position which are oppositely arranged. The two ends of the guide piece 50 can be respectively limited and matched with the first limiting part 71 and the second limiting part 72 to limit the moving stroke of the guide piece 50. In this way, the opening and closing accuracy of the valve can be further improved. In the embodiment, the distribution directions of the first limiting part 71 and the second limiting part 72 are the same as the distribution directions of the first memory alloy spring and the second memory alloy spring.

[0066] In the open valve state, the first memory alloy spring is in a shortened state, and the second memory alloy spring is in an elongated state. Due to the limiting effect of the guide piece 50 and the first limiting part 71, the force of the second memory alloy spring is still greater than the force of the first memory alloy spring at this time. In this way, the situation that the valve core component 20 shakes in the open valve state can be reduced or avoided.

[0067] When the first opening 102 is closed, the first memory alloy spring is elongated, and the second memory alloy spring is contracted. 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 the first opening 102 is closed, the valve core component 20 reaches the limit closing valve position under the action of the guide piece 50 and the second limiting part 72, so as to ensure the closing valve accuracy.

[0068] In the embodiment, the first mounting port 103 is coaxially arranged with the first opening 102, and the diameter of the first mounting port 103 is greater than that of the first opening 102. An end face of the end of the first mounting port 103 connected with the first opening 102 forms the first limiting part 71. The drain valve further comprises a gasket arranged at the end of the first mounting port 103 away from the first opening 102, and the gasket forms the second limiting part 72. The end face of the end of the first mounting port 103 connected with the first opening 102 is in limiting cooperation with the end face of one end of the guide piece 50, and the gasket is in limiting cooperation with the end face of the other end of the guide piece 50. The above arrangement has the advantages of simple structure and convenient assembly of the drain valve.

[0069] As shown in Figure 2 and Figure 3 , specifically, the valve body 10 comprises a body part 11 and a valve seat 12. The body part 11 is provided with a flow-through passage 101, and the body part 11 is further provided with a second mounting port 1101 which is in communication with the flow-through passage 101. The valve seat 12 is provided with a first opening 102 and a first mounting port 103 which are in communication with each other, and the valve seat 12 is arranged at the second mounting port 1101. The first opening 102 is in communication with the flow-through passage 101. In the embodiment, the valve seat 12 is threadedly connected with the body part 11. In this way, the convenience of assembly of the drain valve can be ensured.

[0070] As shown in Figures 3 to 5 and Figure 10 , in the embodiment, the valve core part 20 further comprises a valve stem 22, and the blocking part 21 is arranged at the end of the valve stem 22 and has a diameter greater than that of the valve stem 22. The valve seat 12 is further provided with a first avoiding groove 121 arranged at the end of the first opening 102 away from the first mounting port 103 and coaxially arranged with the first mounting port 103. The first avoiding groove 121 has a diameter greater than that of the first mounting port 103. In this way, when the blocking part 21 opens the first opening 102, the blocking part 21 is located in the first avoiding groove 121, so that a passage for fluid flow is formed between the first avoiding groove 121 and the blocking part 21.

[0071] Further, the first opening 102 is arranged on the side wall of the flow passage 101, and the valve body 10 is further provided with a second opening 104, the second opening 104 is arranged on the side wall of the flow passage 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 sealing part 21 is arranged corresponding to the second opening 104. In the embodiment, the second opening 104 is arranged on the side wall of the body part 11, and the valve core component 20 includes two sealing parts 21, and the two sealing parts 21 are arranged at the two ends of the valve rod 22 respectively, one of the two sealing parts 21 is arranged corresponding to the first opening 102, and the other sealing part 21 is arranged corresponding to the second opening 104. The flow areas of the first opening 102 and the second opening 104 are the same, and the first opening 102 and the second opening 104 can be opened at the same time. The above arrangement can balance the pressure difference at the two ends of the valve core component 20, and ensure the smoothness of the valve core component 20 when the valve core component 20 is opened.

[0072] Further, in the embodiment, the side wall of the body part 11 is further provided with a second avoiding groove 1102, the second avoiding groove 1102 is coaxial with the second opening 104, and the diameter of the second avoiding groove 1102 is greater than the diameter of the second opening 104. The first memory alloy spring is sleeved on the valve rod 22, and 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 in guiding cooperation with the side wall of the valve rod 22, and the end of the first guide section 31 away from the second guide section 32 is in stop cooperation with the corresponding sealing part 21; the second guide section 32 is located in the second avoiding groove 1102 and is in stop cooperation with the second avoiding groove 1102, and the outer side wall of the second guide section 32 is in guiding cooperation with the side wall of the second avoiding groove 1102; when the first opening 102 is in the closed state, at least 80% of the length of the first guide section 31 is located in the flow passage 101. In this way, the stability of the elongation or shortening process of the first memory alloy spring can be ensured, and the accuracy of the first memory alloy spring in sensing the fluid temperature can be ensured, and the valve opening accuracy can be ensured.

[0073] As shown in FIGS. 1 and 2, Figure 11 and Figure 12 The drain valve provided by the second embodiment of the present application is different from the first embodiment in that:

[0074] When the temperature in the flow passage 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 part 40 is shortened, and the first driving part 30 is elongated, and the first driving part 30 and the second driving part 40 drive the sealing part 21 to open the first opening 102.

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

[0076] When the fluid temperature in the flow passage 101 and the ambient temperature at the first mounting port 103 are both below 3°C, the elastic force of the first memory alloy spring increases, the first memory alloy spring elongates, the elastic force of the second memory alloy spring decreases, and the second memory alloy spring shortens to achieve valve opening.

[0077] When the fluid temperature in the flow passage 101 and the ambient temperature at the first mounting port 103 are both not below 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 becomes larger, and the second memory alloy spring elongates to achieve valve closing.

[0078] Further, when the temperature in the flow passage 101 is not below 3°C and the temperature at the first mounting 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 flow passage 101 is below 3°C and the temperature at the first mounting port 103 is not below 3°C, the valve core component 20 does not move, and the valve core component 20 blocks the first opening 102.

[0079] Specifically, in the embodiment, when the fluid temperature is below 3°C, but the air temperature is still at 3°C or even higher, the actual use condition is local low-temperature water in summer refrigeration, but the ambient temperature is high, and there is no risk of freezing, and it is not desired to open the drain valve in actual use. At this time, the elastic force of the first memory alloy spring increases, but since the temperature at the first mounting port 103 is not below 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, so the first memory alloy spring does not have enough driving force to open the valve core component 20, and at this time the valve core component 20 still maintains the closed valve state, and no unexpected drainage occurs.

[0080] When the fluid temperature is still at 3°C or even higher, but the air temperature is below 3°C, it is not desired to open the drain valve in actual use. At this time, the elastic force of the first memory alloy spring decreases, the first memory alloy spring shortens, 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 moving force to the valve core component 20, and further ensure 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 temperature, the first memory alloy spring force increases, the second memory alloy spring force becomes smaller, 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.

[0082] If the first opening 102 is in the open state and the fluid in the drain valve has been drained, both the first memory alloy spring and the second memory alloy spring are subjected to the air temperature, at this time, if the ambient temperature is below 3℃, the valve remains open; if the ambient temperature is above 3℃ at this time, both the first memory alloy spring and the second memory alloy spring are subjected to the ambient temperature and the first opening is closed.

[0083] If water not less than 3℃ is introduced in a low temperature environment, the first opening 102 is in the open state at the beginning, when the water flows through the first memory alloy spring and the second memory alloy spring, the second memory alloy spring has a larger elastic force and the first memory alloy spring has a smaller elastic force, the elastic force of the second memory alloy spring is greater than that of the first memory alloy spring, the second memory alloy spring is elongated and the first memory alloy spring is shortened, so that the valve is closed. Therefore, the valve closing logic meets the actual use condition.

[0084] Further, in the guide 50 of the embodiment, the end face of the end of the guide part 51 close to the valve core part 20 is arranged protruding from the end face of the end of the connecting rod away from the connecting plate. In this way, when the blocking part 21 blocks the first opening 102, the connecting rod is prevented from further driving the blocking part 21 to move towards the first opening 102, further improving the valve closing precision.

[0085] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0086] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the application unless otherwise specifically stated. It is to be understood that the drawings are not necessarily to scale as the dimensions of the parts shown are for the purpose of illustration and description only and not intended to limit the scope of the application. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail but are intended to be understood as a part of the specification when appropriate. In all examples shown and discussed herein, any specific values are to be interpreted as illustrative only and not as a limitation. Thus, other examples of the exemplary embodiments can have different values. It is to be noted that like numbers and letters refer to like elements throughout the several views of the drawings and that, as such, detailed descriptions of these elements are not necessary in each disclosure where these elements are discussed.

[0087] In the description of the application, it should be understood that the orientation words such as "front, back, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the scope of protection of the application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0088] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0089] In addition, it should be noted that the use of "first", "second" and the like to define parts only facilitates the differentiation of corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as a limitation on the scope of protection of the application.

[0090] The above only describes the preferred embodiments of the application and is not intended to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the scope of protection of the application.

Claims

1. A drain valve characterized by, The drain valve comprises: a valve body (10) comprising a flow passage (101), a first opening (102) and a first mounting port (103), the first mounting port (103) being located outside the flow passage (101), and two ends of the first opening (102) being in communication with the flow passage (101) and the first mounting port (103) respectively; a valve core component (20) movably arranged in the flow passage (101), the valve core component (20) having a blocking part (21) arranged correspondingly to the first opening (102), the blocking part (21) being capable of blocking or opening the first opening (102); a first driving member (30) and a second driving member (40) arranged in the flow passage (101) and the first mounting port (103) respectively, the first driving member (30) and the second driving member (40) being in driving connection with the valve core component (20) respectively, the first driving member (30) and the second driving member (40) being located on two sides of the blocking part (21) along the moving direction of the valve core component (20), the first driving member (30) being capable of sensing the temperature in the flow passage (101), and the second driving member (40) being capable of sensing the temperature at the first mounting port (103); wherein the first driving member (30) is capable of elongating or shortening with the change of temperature, the second driving member (40) is capable of elongating or shortening with the change of temperature, and the first driving member (30) and the second driving member (40) cooperatively drive the valve core component (20) to move, so as to make the blocking part (21) block or open the first opening (102); when the temperature in the flow passage (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 elongated, and the second driving member (40) is shortened, the first driving member (30) and the second driving member (40) drive the blocking part (21) to open the first opening (102); or when the temperature in the flow passage (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) is shortened, and the second driving member (40) is elongated, the first driving member (30) and the second driving member (40) drive the blocking part (21) to open the first opening (102); when the temperature in the flow passage (101) is not lower than the first preset temperature or the temperature at the first mounting port (103) is not lower than the second preset temperature, the blocking part (21) blocks the first opening (102).

2. The drain valve of claim 1, wherein, The drain valve further comprises: a guide member (50) arranged in the first mounting port (103), the guide member (50) being arranged between the second driving member (40) and the valve body (10), and the guide member (50) being capable of guiding cooperation with the second driving member (40).

3. The drain valve of claim 2, wherein, The guide piece (50) comprises a guide portion (51) and a connecting portion (52) connected with each other, the guide portion (51) is sleeved on the outer side of the second driving piece (40) and is in guiding cooperation with the second driving piece (40), the connecting portion (52) is located at one end of the second driving piece (40) close to the spool component (20), the connecting portion (52) comprises a first connecting end (521) and a second connecting end (522) oppositely arranged along the axis direction of the guide portion (51), the first connecting end (521) is connected with the guide portion (51), the second connecting end (522) abuts against the spool component (20), and one end of the second driving piece (40) close to the spool component (20) is connected with at least one of the guide portion (51) and the connecting portion (52).

4. The drain valve of claim 3, wherein, The second connecting end (522) is connected with the end face of the blocking portion (21), and the drain valve further comprises: a positioning structure (60) arranged between the blocking portion (21) and the second connecting end (522), the positioning structure (60) is used for limiting the position between the second connecting end (522) and the end face of the blocking portion (21).

5. The drain valve of claim 3, wherein, In the axial direction of the first mounting port (103), a first limiting portion (71) and a second limiting portion (72) are arranged in the first mounting port (103) at intervals, the guide piece (50) is located between the first limiting portion (71) and the second limiting portion (72), and the two ends of the guide piece (50) can be respectively limited and cooperated with the first limiting portion (71) and the second limiting portion (72) to limit the moving stroke of the guide piece (50).

6. The drain valve according to claim 5, wherein the first mounting port (103) is coaxially arranged with the first opening (102), the diameter of the first mounting port (103) is greater than that of the first opening (102), and the end face of one end of the first mounting port (103) connected with the first opening (102) forms the first limiting portion (71); the drain valve further comprises a gasket, the gasket is arranged at one end of the first mounting port (103) away from the first opening (102), and the gasket forms the second limiting portion (72); wherein the end face of one end of the first mounting port (103) connected with the first opening (102) is limited and cooperated with the end face of one end of the guide piece (50), and the gasket is limited and cooperated with the end face of the other end of the guide piece (50).

7. The drain valve of claim 1, wherein, The valve body (10) comprises: a body portion (11) provided with the flow-through channel (101), the body portion (11) is further provided with a second mounting port, and the second mounting port is in communication with the flow-through channel (101); a valve seat (12) provided with the first opening (102) and the first mounting port (103) in communication with each other, the valve seat (12) is arranged at the second mounting port, and the first opening (102) is in communication with the flow-through channel (101).

8. The drain valve of claim 1, wherein, The first opening (102) is arranged on the side wall of the flow passage (101), and the valve body (10) is further provided with a second opening (104), the second opening (104) is arranged on the side wall of the flow passage (101), and the second opening (104) is coaxially arranged with the first opening (102), and one end of the valve core component (20) away from the sealing part (21) is arranged correspondingly with the second opening (104).

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