Liquid level monitoring structure, drainage device and heat exchange equipment

Abstract

The present invention relates to a liquid level monitoring structure, a drainage device and a heat exchange device. The liquid level monitoring structure includes: a lifting transmission mechanism, including a float and a transmission component controlled by the float; a monitoring mechanism, including a control switch, a first monitoring circuit and a second monitoring circuit, the control switch is controlled by the transmission component and can selectively conduct the first monitoring circuit and the second monitoring circuit; wherein, when the float follows the liquid level of the liquid to be measured to drop to the first position, the transmission component is controlled to operate the control switch to conduct the first monitoring circuit; when the float follows the liquid level of the liquid to be measured to rise to the second position, the transmission component is controlled to operate the control switch to conduct the second monitoring circuit. The above-mentioned liquid level detection device can convert the liquid level rise and fall of condensed water into the on-off of the first monitoring circuit and the second monitoring circuit through the lifting transmission mechanism, and has high monitoring precision and accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchange, and in particular to a liquid level monitoring structure, a drainage device and a heat exchange equipment. Background Art

[0002] With the development of economy and technology and the improvement of living standards, people pay more and more attention to environmental protection, and as a result, people's requirements for the energy efficiency of household appliances are also getting higher and higher.

[0003] A condensing gas water heater is a device that uses gas combustion for heating and outputs hot water for people to use. Since the condensing water heater can use the efficient condensing preheat recovery device to absorb the existing heat in the high-temperature flue gas discharged by the water heater and the latent heat released by the condensation of water vapor, the thermal efficiency of the condensing gas water heater is much higher than that of ordinary water heaters. Therefore, it is increasingly widely used in people's production and life. However, the condensed water that comes with it has also become a problem that needs to be considered and dealt with in the design of condensing wall-mounted boilers. According to the requirements of standard CJ / T 395-2012, the condensing water heater needs to be equipped with a condensate blockage monitoring device, so that when the condensate of the condensing boiler is blocked, the CO in the flue gas will be detected before the condensing boiler is safely shut down or locked. u=1 The concentration should not exceed 0.2%.

[0004] There are two main ways to monitor the condensate of existing condensing gas water heaters:

[0005] One of the monitoring methods is through pure structural design. When the condensate is blocked, the effective exhaust area of ​​the exhaust port of the condensing furnace will be reduced. Therefore, the wind pressure monitoring device can be used to indirectly monitor the condensate blockage. This monitoring method has high requirements for the condensing chamber structure, and it will also increase the exhaust resistance. In addition, the structural design requirements and processing difficulty are relatively high.

[0006] Another monitoring method is to use the conductivity of the condensate, install a detection electrode in the condensate chamber or condensate collection device, and use a special detection circuit to monitor whether the electrode is immersed in the condensate to directly determine whether the condensate is blocked. This monitoring method is affected by the internal resistance of the condensate, especially since the gas source composition of the gas is not uniform, the internal resistance of the condensate produced varies greatly, and the reliability is greatly reduced, making it difficult to accurately monitor whether the condensate is blocked, which brings safety hazards to the use of gas water heaters. Summary of the invention

[0007] Based on this, it is necessary to provide a liquid level monitoring structure, drainage device and heat exchange equipment that can accurately monitor the working status of the condensate discharge device in the gas water heater to address the problem that the abnormality of the condensate discharge device in the gas water heater cannot be accurately monitored.

[0008] A liquid level monitoring structure is used to monitor the liquid level height of a liquid to be measured, and the liquid level monitoring structure comprises:

[0009] A lifting transmission mechanism, comprising a float and a transmission component controlled by the float; and

[0010] A monitoring mechanism, comprising a control switch, a first monitoring circuit and a second monitoring circuit, wherein the control switch is controlled by the transmission component and can selectively conduct the first monitoring circuit and the second monitoring circuit;

[0011] When the float follows the liquid level of the liquid to be measured to drop to the first position, the transmission component is controlled to operate the control switch to turn on the first monitoring circuit; when the float follows the liquid level of the liquid to be measured to rise to the second position, the transmission component is controlled to operate the control switch to turn on the second monitoring circuit.

[0012] The above-mentioned liquid level detection device can convert the rise and fall of the liquid level of condensed water into the on-off of the first monitoring circuit and the second monitoring circuit through the lifting transmission mechanism. Therefore, it is not affected by the difference in internal resistance of the condensed liquid and has high monitoring precision and accuracy.

[0013] In one embodiment, when the float is in the first position, the float is separated from the transmission component, and the transmission component operates the control switch to turn on the first monitoring circuit; when the float is in the second position, the float adsorbs the transmission component, and the transmission component operates the control switch to turn on the second monitoring circuit.

[0014] In one embodiment, the float is located in the second monitoring circuit. When the second monitoring circuit is turned on, the float generates magnetism to attract the transmission component. When the first monitoring circuit is disconnected, the float loses magnetism to separate from the transmission component.

[0015] In one embodiment, the transmission assembly includes a support seat and a lever, wherein the lever is supported on the support seat, and the lever is controlled by the float to rotate with its support point on the support seat as the rotation center.

[0016] In one embodiment, the lever comprises a first end and a second end respectively located on both sides of the support point, the first end is located on the lifting path of the float, and the second end is connected to the control switch;

[0017] When the float is in the first position, the float is separated from the first end, and the second end drives the control switch to turn on the first monitoring circuit; when the float is in the second position, the float adsorbs the first end, and the second end drives the control switch to turn on the second monitoring circuit.

[0018] In one embodiment, the first end is provided with a magnetically attracted member, and the float can attract the attracted member within a preset attraction distance.

[0019] In one embodiment, the transmission assembly further includes a first tension spring and a second tension spring, the torque of the first tension spring is greater than the torque of the second tension spring, the first tension spring is used to apply tension to the second end so that the control switch turns on the first monitoring circuit, and the second tension spring is used to apply tension to the control switch so that the control switch turns on the second monitoring circuit.

[0020] In one embodiment, the first monitoring circuit is provided with a first contact, the second monitoring circuit is provided with a second contact, and the control switch can contact the first contact to turn on the first monitoring circuit or contact the second contact to turn on the second monitoring circuit.

[0021] A drainage device comprises the above-mentioned liquid level monitoring structure.

[0022] In one of the embodiments, the drainage device includes a drainage shell, the drainage shell is provided with a drainage cavity and a drainage port connected to the drainage cavity, and the liquid level monitoring structure is partially installed in the drainage cavity.

[0023] A heat exchange device comprises the above-mentioned liquid level monitoring structure, wherein the heat exchange device is a condensing gas water heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of a drainage device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0028] like Figure 1 As shown, a heat exchange device (not shown) of an embodiment of the present invention is provided with a drainage device 100 for discharging condensed water. The structure of the drainage device 100 in the present application is described below by taking the heat exchange device as a condensing gas water heater as an example. This embodiment is only used as an example and does not limit the technical scope of the present application. It can be understood that in other embodiments, the heat exchange device can also be specifically other equipment equipped with the drainage device 100, which is not limited here.

[0029] The drainage device 100 includes a drainage housing 20 and a drainage pipe (not shown). Specifically, the drainage housing 20 is a hollow cylindrical structure, including a bottom wall and a side wall extending from the edge of the bottom wall in the same direction, and the side wall surrounds the bottom wall in the circumferential direction to form a drainage cavity 21. The bottom wall is provided with a drainage port 23 connected to the drainage cavity 21, and the drainage pipe is connected to the drainage housing 20 through the drainage port 23. In this way, the condensed water in the drainage cavity 21 is discharged through the drainage pipe. It can be understood that the shape and structure of the drainage housing 20 are not limited thereto, and can be set to different shapes as needed.

[0030] In order to monitor the liquid level of condensed water in the drainage chamber 21, the drainage device 100 also includes a liquid level monitoring structure 40 installed in the drainage chamber 21. The liquid level monitoring structure 40 can be electrically connected to the main control board of the heat exchange equipment, and the main control board can control the working state of the heat exchange equipment according to the working state of the liquid level monitoring structure 40.

[0031] Specifically, when the drain pipe is in a normal drainage state, the liquid level monitoring structure 40 is not in contact with the condensed water. When the drain pipe is blocked, the condensed water in the drainage chamber 21 cannot be discharged normally and accumulates in the drainage chamber 21, causing the liquid level of the condensed water to rise continuously in the first direction perpendicular to the bottom wall of the drainage housing 20. When the liquid level of the condensed water rises to the warning height, the working state of the liquid level monitoring structure 40 changes, and the main control board controls the heat exchange equipment to shut down for protection according to the working state of the liquid level monitoring structure 40, thereby preventing the liquid level of the condensed water in the drainage chamber 21 from continuing to rise.

[0032] Please continue reading Figure 1The liquid level monitoring structure 40 includes a lifting transmission mechanism and a monitoring mechanism. The lifting transmission mechanism can control the working state of the monitoring mechanism according to the lifting and lowering of the liquid level of the condensed water. The monitoring mechanism is electrically connected to the main control board, and the main control board can control the heat exchange equipment according to the working state of the monitoring mechanism.

[0033] The lifting transmission mechanism includes a limit cover 412 , a floating ball 414 , and a transmission component controlled by the floating ball 414 .

[0034] Specifically, the limiting cover 412 is a hollow cylindrical structure, including a limiting cover top wall and a limiting cover side wall, the limiting cover top wall is spaced apart from the bottom wall of the drain housing 20, the limiting cover side wall extends from the edge of the limiting cover top wall toward the bottom wall of the drain housing 20 until it is connected to the bottom wall of the drain housing 20, the limiting cover side wall surrounds the outer periphery of the limiting cover top wall, and together with the limiting cover top wall and the bottom wall of the drain housing 20, defines a limiting space for limiting the floating ball 414. A plurality of water holes 4121 connecting the limiting space and the drain cavity 21 are spaced apart on the limiting cover side wall.

[0035] When the drain pipe is draining normally, the liquid level in the drain cavity 21 is lower than the height of the water hole 4121, and the side wall of the limit cover blocks the condensed water outside, so that there is no condensed water in the connecting space. When the drain pipe is in a blocked state, the liquid level of the condensed water in the drain cavity 21 continues to rise, passes through the water hole 4121 and enters the limit space, and the liquid level in the limit space gradually rises until it is equal to the water level in the drain cavity 21.

[0036] The float 414 is limited in the limited space, and the float 414 can be in the first position or the second position following the rise and fall of the liquid level of the liquid to be tested. When there is no condensed water in the limited space, the float 414 falls on the bottom wall of the drainage housing 20 and is in the first position (i.e., the lowest limit position of the float 414). When there is condensed water in the limited space, the float 414 can float in the condensed water and be located between the first position and the second position (i.e., a part of the float 414 is located below the liquid level of the condensed water, and another part of the float 414 is located above the liquid level). When the liquid level of the condensed water in the limited space rises to the warning height, the float 414 is in the second position (i.e., the highest limit position of the float 414).

[0037] Specifically, the float 414 is generally spherical in structure, including a float body and an electromagnet disposed on the float body. The electromagnet can generate magnetism to attract the transmission component when it is powered on, and when the electromagnet is powered off, the electromagnet loses its magnetism and separates from the transmission component. In this way, the float 414 controls the working state of the transmission component according to the rise and fall of the liquid level of the condensed water by means of electromagnet adsorption. It can be understood that the shape and specific structure of the float 414 are not limited and can be set according to different needs.

[0038] The transmission assembly includes a support seat 4161 and a lever 4163. The support seat 4161 is fixed to an external fixed structure, and the lever 4163 is a rod-shaped structure. The middle part of the lever 4163 is supported on the support seat 4161 and is controlled by the float 414 to rotate with its support point on the support seat 4161 as the rotation center, so that the transmission assembly is in the first working state or the second working state.

[0039] The lever 4163 includes a first end 4162 and a second end 4164 located on both sides of the support point. The first end 4162 is provided with an attracted member 4162a located on the lifting path of the float 414. The attracted member 4162a is made of a material such as metal that can be attracted by the magnetism generated by the float 414, so it can contact the float 414 under the attraction of the float 414. The second end 4164 is connected to the monitoring mechanism to change the working state of the monitoring mechanism.

[0040] Specifically, when the float 414 is in the first position, the float 414 is separated from the attracted member 4162a and keeps a certain distance from the attracted member 4162a, so the attraction to the attracted member 4162a is small and the initial position of the first end 4162 cannot be changed. At this time, the transmission assembly is in the first working state. In the process of the float 414 following the liquid level of the condensed water rising to the second position, the attraction of the float 414 to the first end 4162 gradually increases. When the float 414 reaches the second position, the distance between the float 414 and the first end 4162 gradually decreases, so the attraction to the attracted member 4162a gradually increases until the attracted member 4162a contacts it, thereby driving the transmission assembly to switch to the second working state.

[0041] The monitoring mechanism includes a control switch 432 , a first monitoring circuit 434 and a second monitoring circuit 436 . The first monitoring circuit 434 and the second monitoring circuit 436 are mutually exclusive circuits. The control switch 432 is controlled by the transmission component and can selectively conduct the first monitoring circuit 434 and the second monitoring circuit 436 .

[0042] Specifically, the first monitoring circuit 434 and the second monitoring circuit 436 are connected in parallel to the main control board, the first monitoring circuit 434 is provided with a first contact 4341, and the second monitoring circuit 436 is provided with a second contact 4361. The control switch 432 is a rocker switch, one end of the control switch 432 is used to contact the first contact 4341, and the other end of the control switch 432 is used to contact the second contact 4361, and the end of the control switch 432 close to the first contact 4341 is connected to the second end 4164 of the lever 4163. In this way, the second end 4164 of the lever 4163 operates the control switch 432 to contact the first contact 4341 to turn on the first monitoring circuit 434 or to contact the second contact 4361 to turn on the second monitoring circuit 436.

[0043] Furthermore, the float 414 is located in the first monitoring circuit 434. When the first monitoring circuit 434 is turned on, the float 414 generates magnetism to attract the transmission component. When the first monitoring circuit 434 is turned off, the float 414 loses its magnetism and is separated from the transmission component. Therefore, when the liquid level of the condensed water gradually decreases, the float 414 also gradually decreases with the liquid level until it returns to the first position.

[0044] Furthermore, the transmission assembly further includes a first tension spring 4165 and a second tension spring 4167, and the torque of the first tension spring 4165 is greater than the torque of the second tension spring 4167, so as to assist in controlling the working state of the lever 4163. Specifically, the two ends of the first tension spring 4165 are respectively connected to the second end 4164 of the lever 4163 and the external fixed structure, so as to apply tension to the second end 4164 to conduct the first monitoring circuit 434. The two ends of the second tension spring 4167 are respectively connected to one end of the control switch 432 connected to the second contact 4361 and the external fixed structure, so as to apply tension to the control switch 432 to conduct the second monitoring circuit 436.

[0045] In this way, the transmission assembly is controlled to operate the control switch 432 to conduct the first monitoring circuit 434 or the second monitoring circuit 436. When the transmission assembly is in the first working state, since the torque of the first tension spring 4165 is greater than the torque of the second tension spring 4167, the control switch 432 connected to the second end 4164 contacts the first contact 4341 under the tension of the first tension spring 4165 to conduct the first monitoring circuit 434. When the transmission assembly is in the second working state, the second end 4164 of the lever 4163 drives the end of the control switch 432 contacting the first contact 4341 to move upward to separate from the first contact 4341, so that the control switch 432 rotates under the tension of the second tension spring 4167 and contacts the second contact 4361 to conduct the second monitoring circuit 436.

[0046] The working process of the drainage device 100 is as follows:

[0047] When the drainage device 100 is in a normal drainage state, condensed water is discharged normally through the drain port 23, so there is no condensed water in the limited space, and the float 414 is located on the bottom wall of the drainage shell 20 and is separated from the attracted part 4162a of the first end 4162 of the lever 4163. The control switch 432 contacts the first contact 4341 under the tension of the first tension spring 4165 and turns on the first monitoring circuit 434, so the float 414 is in a conductive state and has magnetism, and the main control board can detect that the first monitoring circuit 434 is in a conductive state, thereby controlling the heat exchange equipment to operate normally.

[0048] When the drainage device 100 is in an abnormal drainage state, the structures such as the drainage port 23 are blocked, and the condensed water cannot be discharged normally, causing the liquid level of the condensed water in the drainage chamber 21 to continue to rise, and then causing the liquid level of the condensed water in the limited space to continue to rise. The float 414 continues to rise with the liquid level, and the attraction of the float 414 to the attracted part 4162a continues to increase.

[0049] When the float 414 rises to the second position, the float 414 attracts the attracted member 4162a so that the attracted member contacts the float 414, thereby driving the second end 4164 of the lever 4163 to move upward and driving one end of the control switch 432 to separate from the first contact 4341, and the other end of the control switch 432 contacts the second contact 4361 under the tension of the second tension spring 4167 to conduct the second monitoring circuit 436. At this time, the main control board can detect that the second monitoring circuit 436 is in the conducting state and the first monitoring circuit 434 is in the disconnected state, thereby controlling the heat exchange equipment to shut down for protection to prevent the liquid level of the condensed water from continuing to rise.

[0050] When the drainage device 100 resumes normal drainage, since the first monitoring circuit 434 is in the disconnected state, the float 414 has no magnetism, and the float 414 can be separated from the float 414 and fall with the drop of the liquid level, thereby realizing the automatic reset of the float 414. At the same time, the first end 4162 of the lever 4163 loses the attraction of the float 414, so the second end 4164 of the lever 4163 moves downward under the tension of the first tension spring 4167, and finally drives the control switch 432 to leave the second contact 4361 and re-contact the first contact 4341, so the second monitoring circuit 436 is disconnected, and the first monitoring circuit 434 is turned on again, so that the float 414 is re-charged.

[0051] The above-mentioned liquid level monitoring structure 40, drainage device 100 and heat exchange equipment can convert the rise and fall of the liquid level of the condensate into the on-off of the first monitoring circuit 434 and the second monitoring circuit 436 through the liquid level monitoring structure 40 disposed in the drainage housing 20, so as to accurately determine whether the drainage device 100 is blocked according to the on-end of the circuit. Since the monitoring process of the liquid level monitoring structure 40 is not affected by the non-uniform gas source composition of the heat exchange equipment, the liquid level monitoring structure 40 has high monitoring accuracy and reliability, thereby ensuring the safe operation of the heat exchange equipment.

[0052] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A liquid level monitoring structure, used to monitor the liquid level of a liquid to be tested, characterized in that: The liquid level monitoring structure comprises: A lifting transmission mechanism, comprising a floating ball (414) and a transmission component controlled by the floating ball (414); and A monitoring mechanism, comprising a control switch (432), a first monitoring circuit (434), and a second monitoring circuit (436), wherein the control switch (432) is controlled by the transmission component and can selectively conduct the first monitoring circuit (434) and the second monitoring circuit (436); The float (414) is located in the first monitoring circuit (434); when the float (414) follows the liquid level of the liquid to be measured and drops to a first position, the float (414) is separated from the transmission component, the transmission component operates the control switch (432) to turn on the first monitoring circuit (434), and the float (414) generates magnetism to attract the transmission component; when the float (414) follows the liquid level of the liquid to be measured and rises to a second position, the float (414) adsorbs the transmission component, the transmission component operates the control switch (432) to turn on the second monitoring circuit (436), and the float (414) loses magnetism to separate from the transmission component.

2. The liquid level monitoring structure according to claim 1, characterized in that: The transmission assembly comprises a support seat (4161) and a lever (4163), wherein the lever (4163) is supported on the support seat (4161), and the lever (4163) is controlled by the float (414) to rotate with its supporting point on the support seat (4161) as the rotation center.

3. The liquid level monitoring structure according to claim 2, characterized in that: The lever (4163) comprises a first end (4162) and a second end (4164) respectively located on both sides of the support point, the first end (4162) being located on the lifting path of the float (414), and the second end (4164) being connected to the control switch (432); When the float (414) is in the first position, the float (414) is separated from the first end (4162), and the second end (4164) drives the control switch (432) to turn on the first monitoring circuit (434); when the float (414) is in the second position, the float (414) is adsorbed on the first end (4162), and the second end (4164) drives the control switch (432) to turn on the second monitoring circuit (436).

4. The liquid level monitoring structure according to claim 3, characterized in that: The first end (4162) is provided with an attracted member (4162a) that can be attracted by magnetism, and the floating ball (414) can attract the attracted member (4162a) within a preset attraction distance.

5. The liquid level monitoring structure according to claim 3, characterized in that: The transmission assembly further comprises a first tension spring (4165) and a second tension spring (4167), wherein the torque of the first tension spring (4165) is greater than the torque of the second tension spring (4167), the first tension spring (4165) is used to apply a tension to the second end (4164) so ​​that the control switch (432) turns on the first monitoring circuit (434), and the second tension spring (4167) is used to apply a tension to the control switch (432) so that the control switch (432) turns on the second monitoring circuit (436).

6. The liquid level monitoring structure according to claim 1, characterized in that: The first monitoring circuit (434) is provided with a first contact (4341), and the second monitoring circuit (436) is provided with a second contact (4361). The control switch (432) can contact the first contact (4341) to turn on the first monitoring circuit (434) or contact the second contact (4361) to turn on the second monitoring circuit (436).

7. A drainage device, characterized in that: It comprises the liquid level monitoring structure as described in any one of claims 1 to 6.

8. The drainage device according to claim 7, characterized in that: The drainage device comprises a drainage housing (20), the drainage housing (20) being provided with a drainage cavity (21) and a drainage port (23) communicating with the drainage cavity (21), and the liquid level monitoring structure being partially installed in the drainage cavity (21).

9. A heat exchange device, characterized in that: It comprises the liquid level monitoring structure as described in any one of claims 1 to 6, wherein the heat exchange equipment is a condensing gas water heater.

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