A temperature sensing element and a temperature and pressure safety valve

Abstract

This application relates to the field of safety valve technology and discloses a temperature sensing element and a temperature and pressure safety valve, including a safety valve body and a temperature sensing element. The temperature sensing element is installed on the safety valve body and includes a housing, a temperature sensing medium, and a push rod. The housing has a cavity extending along a first direction, and the cavity has an opening on one side along the first direction to facilitate the installation of the temperature sensing medium and the push rod into the cavity through the opening. The push rod includes a first unit rod and a second unit rod installed in the cavity. The first unit rod is located between the second unit rod and the temperature sensing medium, and the second unit rod extends at least partially outside the cavity. By dividing the push rod into a first unit rod and a second unit rod, the length of each unit rod is reduced, thereby preventing stress concentration in the push rod and preventing bending of the temperature sensing element during use, which could cause the housing to crack, thus improving the service life of the temperature sensing element.

Description

Technical Field

[0001] This utility model relates to the field of safety valve technology, specifically to a temperature sensing element and a temperature and pressure safety valve. Background Technology

[0002] A temperature and pressure safety valve is a safety device used to prevent equipment or systems from exceeding pressure limits due to excessively high temperatures.

[0003] The temperature-sensing element of the temperature and pressure safety valve mainly includes an outer shell, paraffin wax, a sealing gasket, a piston rod, and a spring. The paraffin wax and the sealing gasket are placed inside the outer shell, with the sealing gasket abutting against the top of the paraffin wax and the bottom of the piston rod abutting against the sealing gasket. The spring is connected to both the piston rod and the outer shell, providing a force to the piston rod towards the paraffin wax. The piston rod is driven to rise and fall by the change in the shape of the paraffin wax, thereby achieving temperature sensing.

[0004] However, the temperature sensing elements on the market are relatively long, resulting in a longer piston rod. This can easily lead to stress concentration during use, causing the piston rod to bend and affecting the triggering stability of the safety valve. At the same time, a bent piston rod can easily damage the outer casing, affecting the service life of the temperature sensing element. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this application is to provide a temperature sensing element and a temperature and pressure safety valve to improve the service life of the temperature sensing element.

[0006] A temperature sensing element includes: a housing, a temperature sensing medium, and a push rod. The housing has a cavity extending along a first direction, and an opening is formed on one side of the cavity along the first direction. The temperature sensing medium is placed in the cavity and is capable of undergoing a phase change under the influence of ambient temperature, resulting in a volume change of the temperature sensing medium. The push rod is at least partially installed in the cavity and is movable along the first direction during the phase change of the temperature sensing medium. The push rod includes a first unit rod and a second unit rod. The first unit rod is completely installed inside the cavity and is located between the second unit rod and the temperature sensing medium. The second unit rod extends at least partially outside the cavity.

[0007] Furthermore, the maximum stroke of the push rod moving along the first direction is L; the minimum length of the first unit rod is greater than the maximum stroke L of the push rod.

[0008] Furthermore, the maximum stroke of the push rod moving along the first direction is L; the minimum length of the second unit rod extending into the cavity is greater than the maximum stroke L of the push rod.

[0009] Furthermore, along the first direction, the temperature-sensing medium undergoes a change of state under the influence of the ambient temperature, causing the temperature-sensing medium to move toward the end of the push rod; the maximum stroke of the push rod along the first direction is the maximum amount of movement of the temperature-sensing medium toward the end of the push rod.

[0010] Furthermore, the diameters of the first and second unit rods are less than or equal to the inner diameter of the cavity.

[0011] Furthermore, the top rod also includes at least one transition rod, which is located between the first unit rod and the second unit rod along the first direction.

[0012] Furthermore, the temperature sensing element also includes a sealing element, which is connected to the first unit rod; a sealed cavity is formed in the cavity through the sealing element, and the temperature sensing medium is filled in the sealed cavity.

[0013] Furthermore, the seal is located between the temperature-sensing medium and the first unit rod.

[0014] Furthermore, the seal is spherical.

[0015] A temperature and pressure safety valve includes a safety valve body, a spring, a pressure relief component, and the aforementioned temperature sensing element. A pressure relief port is formed within the safety valve body, and the pressure relief component is installed in the pressure relief port. The spring and the push rod of the temperature sensing element respectively abut against the upper and lower ends of the pressure relief component. Furthermore, under the action of a change in the state of the temperature-sensing medium, the push rod drives the pressure relief component to move along a first direction, causing the temperature and pressure safety valve to include a pressure-relieved state and a closed state. When the temperature and pressure safety valve is in the pressure-relieved state, the pressure relief component separates from the pressure relief port; when the temperature and pressure safety valve is in the closed state, the pressure relief component seals the pressure relief port.

[0016] By using a multi-segment push rod, stress concentration on the push rod can be reduced, thereby preventing the housing from cracking during the use of the temperature sensing element and improving the service life of the temperature sensing element. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the temperature and pressure safety valve provided in this application.

[0018] Figure 2 yes Figure 1 The diagram shows a cross-sectional view of the temperature-sensing element of a temperature and pressure safety valve, wherein the push rod of the temperature-sensing element includes only the first unit rod and the second unit rod.

[0019] Figure 3 yes Figure 1 The diagram shows the travel stroke of the push rod of the temperature sensing element in the temperature and pressure safety valve.

[0020] Figure 4 yes Figure 1The diagram shows a cross-sectional view of the temperature-sensing element of a temperature-pressure safety valve, wherein the top rod of the temperature-sensing element includes only the first unit rod, the second unit rod, and the transition rod.

[0021] Figure 5 yes Figure 1 The diagram shows the pressure relief process of the temperature and pressure safety valve.

[0022] Reference numerals: 1. Housing; 1-1. Cavity; 1-2. Opening; 1-3. Sealing cavity; 1-4. Connecting ring; 2. Temperature sensing medium; 3. Top rod; 3-1. First unit rod; 3-2. Second unit rod; 3-3. Transition rod; 4. Seal; 5. Safety valve body; 5. Pressure relief port; 5-1. Mounting port; 5-2. Discharge port; 5-3. Spring; 6. Pressure relief component; 7. Pressure relief bracket; 7-1. Deformable part; 7-2. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present application, the technical solutions in specific embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0024] like Figure 1 As shown, as one implementation, this application provides a temperature and pressure safety valve, including a safety valve body 5 and a temperature sensing element. The temperature sensing element is installed on the safety valve body 5 and detects the ambient temperature at the location to be detected, so as to control the safety valve body 5 to switch between working states such as closed state and pressure relief state based on the ambient temperature.

[0025] To more clearly describe the technical solution of this application, the following are defined: Figure 1 The vertical direction is shown. The first direction refers to the axial extension direction of the temperature sensing element, i.e. Figure 1 The up and down directions in the middle.

[0026] like Figure 1 and Figure 2 As shown, in one implementation, the temperature sensing element includes a housing 1, a temperature sensing medium 2, and a push rod 3. The housing 1 has a cavity 1-1 extending along a first direction, and the cavity 1-1 has an opening 1-2 formed on one side along the first direction, so as to install the temperature sensing medium 2 and the push rod 3 into the cavity 1-1 through the opening 1-2.

[0027] The temperature-sensing medium 2 is filled in the cavity 1-1, and the temperature-sensing medium 2 is located at the end of the cavity 1-1 away from the outlet 1-2.

[0028] The temperature-sensing medium 2 can undergo a change of state under the influence of ambient temperature. During the change of state of the temperature-sensing medium 2, the volume of the temperature-sensing medium 2 changes.

[0029] The push rod 3 is at least partially installed in the cavity 1-1, and during the phase change of the temperature sensing medium 2, the temperature sensing medium 2 can drive the push rod 3 to move along the first direction to trigger a change in the working state of the safety valve body 5.

[0030] It should be noted that the temperature sensing medium 2 can be a material such as paraffin that can switch between liquid and solid states according to the ambient temperature. By switching between liquid and solid states, the temperature sensing medium 2 changes in volume, thereby driving the push rod 3 to move.

[0031] Specifically, the temperature sensing medium 2 has at least two states: solid and liquid. When the temperature sensing medium 2 is in a solid state, its volume is small. When the temperature sensing medium 2 changes from solid to liquid under the influence of ambient temperature, its volume increases, thereby causing the push rod 3 to move upward.

[0032] During the process of the temperature sensing medium 2 changing from a completely solid state to a completely liquid state, the push rod 3 moves along the first direction for a stroke of L, and during the operation of the temperature sensing element, the push rod 3 always moves within this stroke range.

[0033] Furthermore, along the first direction, the temperature-sensing medium 2 undergoes a change of state under the influence of the ambient temperature, causing a change in the volume of the temperature-sensing medium 2, which in turn causes the temperature-sensing medium 2 to move toward the end of the push rod 3.

[0034] The maximum stroke of the push rod along the first direction is the maximum amount of movement of the temperature sensing medium toward the end of the push rod.

[0035] As one implementation, the top rod 3 includes a first unit rod 3-1 and a second unit rod 3-2. During the process of the temperature sensing medium 2 changing volume, the first unit rod 3-1 and the second unit rod 3-2 move simultaneously.

[0036] The first unit rod 3-1 is installed inside the cavity 1-1 and is located between the second unit rod 3-2 and the temperature sensing medium 2. The second unit rod 3-2 extends at least partially outside the cavity 1-1.

[0037] By dividing the top rod 3 into a first unit rod 3-1 and a second unit rod 3-2, the length of each unit rod is reduced, thereby preventing stress concentration in the top rod 3 and preventing bending of the temperature sensing element during use, which could cause the housing 1 to crack, thus improving the service life of the temperature sensing element.

[0038] In one implementation, along the first direction, the minimum length of the first unit rod 3-1 is greater than the travel distance L of the top rod 3.

[0039] By setting the above, the length of the first unit rod 3-1 is avoided from being too short, preventing the first unit rod 3-1 from swinging during movement, improving the movement stability of the first unit rod 3-1, thereby improving the movement accuracy of the top rod 3. At the same time, it can prevent excessive friction between the first unit rod 3-1 and the housing 1, thereby preventing the housing 1 from cracking and improving the service life of the temperature sensing element.

[0040] As one implementation method, when the temperature sensing medium 2 is liquid, the length of the second unit rod 3-2 extending into the cavity 1-1 is the minimum. At this time, the minimum length of the second unit rod 3-2 extending into the cavity 1-1 is greater than the travel stroke L of the top rod 3.

[0041] By adopting the above settings, the length of the push rod 3 extending into the housing 1 is not too short, thereby preventing the second unit rod 3-2 from moving out of the housing 1 when the push rod 3 moves to the second position, thus ensuring the stability of the push rod 3's movement.

[0042] As one implementation method, the diameter of the first unit rod 3-1 is basically the same as the inner diameter of the cavity 1-1. Specifically, the first unit rod 3-1 and the cavity 1-1 adopt a transition fit or clearance fit to reduce the shaking of the first unit rod 3-1 during movement, thereby improving the temperature sensing accuracy of the temperature sensing element, and at the same time, preventing the shell 1 from cracking due to the shaking of the first unit rod 3-1.

[0043] As one implementation method, the diameter of the second unit rod 3-2 is basically the same as the inner diameter of the cavity 1-1. Specifically, the second unit rod 3-2 and the cavity 1-1 adopt a transition fit or clearance fit, thereby reducing the shaking of the second unit rod 3-2 during movement and improving the accuracy of the temperature sensing element.

[0044] It should be noted that in some other implementations, the accuracy requirements of the temperature sensing element are lower. To improve the ease of installation of the first unit rod 3-1 and the second unit rod 3-2, the diameter of the first unit rod 3-1 and the diameter of the second unit rod 3-2 can be smaller than the inner diameter of the cavity 1-1.

[0045] In the above implementation, the top rod 3 includes only one first unit rod 3-1 and one second unit rod 3-2. The top rod 3 is formed by combining the two unit rods, thereby reducing the length of each unit rod 3-1, preventing stress concentration in the unit rod 3-1, and thus preventing the housing from cracking during the use of the temperature sensing element and improving the service life of the temperature sensing element.

[0046] like Figure 3 As shown, as another implementation, the top rod 3 also includes at least one transition rod 3-3, which is located between the first unit rod 3-1 and the second unit rod 3-2.

[0047] By setting the transition rod 3-3, the length of the second unit rod 3-2 can be further shortened, thereby further preventing the second unit rod 3-2 from bending during the movement of the top rod 3, preventing the second unit rod 3-2 from squeezing the housing 1, and thus improving the service life of the temperature sensing element; and by setting the transition rod 3-3, the length of the top rod 3 can be increased, thereby making the top rod 3 adapt to a larger length of housing 1.

[0048] In this implementation, the diameter of the transition rod 3-3 is basically the same as the inner diameter of the cavity 1-1. Specifically, a transition fit or clearance fit is adopted between the transition rod 3-3 and the cavity 1-1 to reduce the shaking during the movement of the transition rod 3-3, thereby improving the accuracy of the temperature sensing element and preventing the housing 1 from cracking due to the shaking of the first unit rod 3-1.

[0049] It should be noted that in some other implementations, the diameter of the transition rod 3-3 can be smaller than the inner diameter of the cavity 1-1 in order to improve the ease of installation of the transition rod 3-3.

[0050] Furthermore, the length of transition rod 3-3 is greater than or equal to the length of the first unit rod 3-1.

[0051] It should be further noted that the number of transition rods 3-3 can be adjusted according to the overall length of the temperature sensing element.

[0052] like Figure 2 and Figure 3 As shown, in one implementation, the temperature sensing element also includes a sealing element 4, which forms a sealed cavity 1-3 in the cavity 1-1. The temperature sensing medium 2 is filled in the sealed cavity 1-3. When the temperature sensing medium 2 changes from solid to liquid or from liquid to solid under the influence of ambient temperature, the sealing element 4 will move in the cavity 1-1 along the first direction as the volume of the temperature sensing medium 2 changes.

[0053] Furthermore, the seal 4 is connected to the first unit rod 3-1, that is, the first unit rod 3-1 abuts against the end of the seal 4 facing the opening 1-2, so as to drive the first unit rod 3-1 to move through the seal 4.

[0054] In one implementation, the seal 4 is located between the temperature sensing medium 2 and the first unit rod 3-1, and the seal 4 is spherical.

[0055] The spherical seal 4 can seal the cavity 1-1 to form a sealed cavity 1-3, which is used to drive the push rod 3 to move. At the same time, when the temperature sensing medium 2 changes in volume, the spherical seal 4 moves faster as the temperature sensing medium 2 changes in volume, which improves the reaction speed of the temperature and pressure safety valve and thus improves the safety of the temperature and pressure safety valve.

[0056] It should be noted that the sealing element 4 can also be a ring-shaped sealing structure such as a sealing ring. This type of ring-shaped sealing element 4 is sleeved on the circumference of the first unit rod 3-1. The sealing element 4 seals the gap between the first unit rod 3-1 and the cavity 1-1, thereby forming a sealed cavity 1-3 in the sealed cavity 1-1 through the first unit rod 3-1 and the sealing element 4.

[0057] As one implementation method, the cavity 1-1 is basically cylindrical in shape. The temperature sensing medium 2, the push rod 3 and the sealing element 4 can move freely in the first direction within the cavity 1-1. After the temperature sensing medium 2, the push rod 3 and the sealing element 4 are installed, there is no need to close the shell 1, which improves the installation convenience of the temperature sensing element.

[0058] Furthermore, in this embodiment, the diameters of the first unit rod 3-1, the second unit rod 3-2, and the transition rod 3-1 are basically consistent with the inner diameter of the cavity 1-1. When assembling the above-mentioned temperature sensing element, there is no need to install components such as springs, thereby further improving the assembly efficiency of the temperature sensing element.

[0059] As one implementation, a connecting ring 1-4 is formed on the end face of the housing 1 where the opening 1-2 is formed. The connection ring 1-4 facilitates the installation of the housing 1 onto the safety valve body 5.

[0060] As one implementation, the temperature and pressure safety valve also includes a spring 6, which is installed inside the safety valve body 5 and abuts against the end face of the push rod 3 away from the housing 1, so that the spring 6 can apply a force toward the housing 1 to the push rod 3, thereby facilitating the push rod 3 to reset under the action of the spring 6 after being pushed up.

[0061] like Figure 5 As shown, as one implementation method, the temperature and pressure safety valve also includes a pressure relief component 7, which is located between the spring 6 and the push rod 3. The spring 6 is connected to the push rod 3 through the pressure relief component 7, so that the force generated by the spring 6 can act stably on the push rod 3, thereby improving the stability of the temperature and pressure safety valve.

[0062] The safety valve body 5 has a pressure relief port 5-1, the pressure relief component 7 is installed in the pressure relief port 5-1, and the spring 6 and the top rod 3 of the temperature sensing element abut against the upper and lower ends of the pressure relief component 7 respectively.

[0063] Under normal conditions (when the temperature-sensing medium 2 is solid), the pressure relief component 7 abuts against the pressure relief port 5-1 under the action of the spring 6, keeping the pressure relief port 5-1 closed. When the ambient temperature is too high, the temperature-sensing medium 2 undergoes a change in state, causing its volume to increase. The push rod 3 moves upward, driving the pressure relief component 7 upward, separating it from the pressure relief port 5-1. Fluid can then flow through the pressure relief port 5-1, thus achieving pressure relief. The pressure relief direction is as follows: Figure 5The direction is indicated by the dotted line in the image.

[0064] Specifically, the safety valve body 5 also includes an installation port 5-2 and a discharge port 5-3. The installation port 5-2 is used to install the safety valve body 5 in the flow path, and the discharge port 5-3 is used to discharge fluid. The pressure relief port 5-1 is located between the installation port 5-2 and the discharge port 5-3.

[0065] As one implementation, the pressure relief component 7 includes a pressure relief bracket 7-1, the top of which is connected to the safety valve body 5, the bottom of which abuts against the pressure relief port 5-1, and the pressure relief bracket 7-1 includes a deformable part 7-2, which can deform.

[0066] When the pressure relief component 7 is subjected to an upward force from the push rod 3, the deformable part 7-2 deforms, allowing the bottom of the pressure relief bracket 7-1 to move along the first direction, thereby separating the bottom of the pressure relief bracket 7-1 from the pressure relief port 5-1 and achieving pressure relief. The working principle of the temperature and pressure safety valve is as follows:

[0067] When the temperature sensing medium 2 changes from solid to liquid under the influence of ambient temperature, the sealing element 4 moves upward, which drives the top rod 3 to move upward. The spring 6 is compressed, and the bottom of the pressure relief bracket 7-1 separates from the pressure relief port 5-1, so that the fluid at the installation port 5-2 flows through the pressure relief port 5-1 to the discharge port 5-3, thereby achieving pressure relief.

[0068] When the temperature sensing medium 2 changes from liquid to solid under the influence of ambient temperature, the top rod 3 and the sealing element 4 move downward under the action of spring 6, and the bottom of the pressure relief bracket 7-1 abuts against the pressure relief port 5-1, switching the temperature and pressure safety valve to the closed state.

[0069] Finally, it should be noted that the above are only some preferred embodiments of this application and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A temperature sensing element, characterized by, include: The housing (1) has a cavity (1-1) extending along a first direction, and an opening (1-2) is formed on one side of the cavity (1-1) along the first direction; The temperature-sensing medium (2) is placed in the cavity (1-1), and the temperature-sensing medium (2) can undergo a change of state under the action of ambient temperature, resulting in a change in the volume of the temperature-sensing medium; A push rod (3) is at least partially installed in the cavity (1-1), and the push rod (3) can move along the first direction during the phase change of the temperature sensing medium (2); The top rod (3) includes a first unit rod (3-1) and a second unit rod (3-2). The first unit rod (3-1) is completely installed inside the cavity (1-1) and is located between the second unit rod (3-2) and the temperature sensing medium (2). The second unit rod (3-2) extends at least partially outside the cavity (1-1).

2. A temperature sensing element according to claim 1, wherein The maximum stroke of the push rod (3) along the first direction is L; The minimum length of the first unit rod (3-1) is greater than the maximum stroke L of the top rod (3).

3. A temperature sensing element according to claim 1, wherein The maximum stroke of the push rod (3) along the first direction is L; The minimum length of the second unit rod (3-2) extending into the cavity (1-1) is greater than the maximum stroke L of the top rod (3).

4. A temperature sensing element according to claim 2 or 3, characterised in that Along the first direction, the temperature-sensing medium (2) undergoes a change of state under the influence of ambient temperature, causing the temperature-sensing medium (2) to move toward the end of the push rod (3); The maximum stroke of the push rod (3) along the first direction is the maximum amount of movement of the temperature sensing medium toward the end of the push rod (3).

5. A temperature sensing element according to claim 1, characterized in that, The diameters of the first unit rod (3-1) and the second unit rod (3-2) are less than or equal to the inner diameter of the cavity (1-1).

6. A temperature sensing element according to claim 1, characterized in that, The top rod (3) further includes at least one transition rod (3-3), which is located between the first unit rod (3-1) and the second unit rod (3-2) along the first direction.

7. A temperature sensing element according to claim 1, characterized in that, The temperature sensing element also includes a sealing element (4), which is connected to the first unit rod (3-1); The sealing member (4) forms a sealing cavity (1-3) within the cavity (1-1), and the temperature-sensing medium (2) fills the sealing cavity (1-3).

8. A temperature sensing element according to claim 7, characterized in that, The sealing element (4) is located between the temperature-sensing medium (2) and the first unit rod (3-1).

9. A temperature sensing element according to claim 7 or 8, characterized in that, The seal (4) is spherical.

10. A temperature and pressure safety valve, characterized in that, It includes a safety valve body (5), a spring (6), a pressure relief component (7), and a temperature sensing element as described in any one of claims 1 to 9; A pressure relief port (5-1) is formed inside the body (5) of the safety valve. The pressure relief component (7) is installed in the pressure relief port (5-1). The spring (6) and the top rod (3) of the temperature sensing element abut against the upper and lower ends of the pressure relief component (7) respectively. Furthermore, under the action of the phase change of the temperature-sensing medium (2), the push rod (3) drives the pressure relief component (7) to move along the first direction, so that the temperature and pressure safety valve includes a pressure relief state and a closed state; When the temperature and pressure safety valve is in the pressure relief state, the pressure relief component (7) is separated from the pressure relief port (5-1); When the temperature and pressure safety valve is in the closed state, the pressure relief component (7) seals the pressure relief port (5-1).

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