Gas water heater detection system

Abstract

The utility model relates to a detection system for a gas water heater, which comprises a gas passage communicated with a gas inlet of the gas water heater, and a gas proportional valve is arranged in the gas water heater; the compressed air channel is communicated with an air inlet of the gas water heater, the compressed air channel and the gas channel can be selectively opened, the compressed air channel is provided with a first pressure regulating valve and an air flow meter used for detecting simulated air flow, and the air flow meter is arranged on the downstream of the first pressure regulating valve; and the controller is electrically connected with the first pressure regulating valve, the air flow meter and the gas proportional valve. The method has the advantages that the heat load of the gas water heater can be determined without gas combustion in a manner of replacing gas with compressed air; in addition, the compressed air flow is converted into the gas flow, so that the opening degree of the gas proportional valve can be adjusted according to the converted gas flow, and the gas water heater can reach the determined heat load.

Description

Technical Field

[0001] This utility model relates to the field of water heating technology, and in particular to a gas water heater detection system. Background Technology

[0002] A gas water heater, also known as a gas-fired instantaneous water heater, is a gas appliance that uses gas as fuel and heats water by burning it, transferring the heat to cold water flowing through a heat exchanger to produce hot water.

[0003] Existing methods for detecting hot water output rate rely on the combustion state of the gas. For example, Chinese invention patent ZL201810172095.3 (authorization announcement number CN108317738B) discloses a water heater safety control method, device, and water heater. This device determines the hot water output rate by acquiring the combustion state information of the water heater. However, existing methods require combustion to determine the hot water output rate. The rate can only be calculated after parameters such as thermal efficiency, temperature difference, and water flow rate have stabilized. Therefore, existing methods for detecting hot water output rate have the following technical problems: First, existing methods adjust the gas flow rate to adjust the water heater's heat load. To achieve the set heat load, the gas flow rate needs continuous adjustment, requiring gas combustion testing. Second, the flow rate on the production line limits the testing time, making it impossible to quickly detect the hot water output rate on the production line. Therefore, further improvements to the existing technology are needed. Utility Model Content

[0004] The first technical problem to be solved by this utility model is to provide a gas water heater detection system that can determine the heat load of a water heater without the need for gas, in contrast to the above-mentioned prior art.

[0005] The second technical problem to be solved by this utility model is to provide a gas water heater detection system that can quickly detect hot water output, in contrast to the above-mentioned prior art.

[0006] The technical solution adopted by this utility model to solve the first technical problem mentioned above is: a gas water heater detection system, comprising:

[0007] A gas passage is connected to the gas inlet of a gas water heater, which is equipped with a gas proportional valve.

[0008] Its features also include:

[0009] A compressed air passage is connected to the air inlet of a gas water heater. The compressed air passage and the gas passage can be opened selectively. The compressed air passage is equipped with a first pressure regulating valve and an air flow meter for detecting simulated air flow. The air flow meter is located downstream of the first pressure regulating valve.

[0010] A controller, electrically connected to a first pressure regulating valve, an air flow meter, and a gas proportional valve, is configured to: adjust the first pressure regulating valve based on the real-time detection result of the air flow meter so that the difference between the real-time detection result of the air flow meter and the theoretical value of the compressed air flow is less than a preset value; and when the difference between the real-time detection result of the air flow meter and the theoretical value of the compressed air flow is less than the preset value, the controller can adjust the opening degree of the gas proportional valve based on the real-time detection result of the air flow meter.

[0011] To solve the second technical problem mentioned above, a circulating water circuit is also included. The circulating water circuit includes an inlet connector that is connected to the inlet of the gas water heater and an outlet connector that is connected to the outlet of the gas water heater. The inlet connector and the outlet connector are connected. The circulating water circuit is equipped with a flow regulating valve and a water flow meter. Both the flow regulating valve and the water flow meter are electrically connected to the controller.

[0012] Preferably, the circulating water circuit is further provided with a first temperature detection unit located near the water inlet and a second temperature detection unit located near the water outlet. The first temperature detection unit is used to detect the water inlet temperature, and the second temperature detection unit is used to detect the water outlet temperature.

[0013] Preferably, at least one high-pressure inlet valve is also provided in the circulating water circuit.

[0014] Preferably, at least one pressure gauge for detecting the pressure on the circulating water circuit is provided in the circulating water circuit.

[0015] Preferably, the circulating water circuit is also equipped with a pressure relief valve for depressurization.

[0016] To enable the detection of the gas passage, a detection passage connected to the gas passage is also included, which is connected to an ignition gun used for open flame detection of whether the gas water heater is leaking.

[0017] Preferably, the detection path is provided with a second pressure regulating valve and a control valve.

[0018] Preferably, the compressed air passage is provided with an air main valve, and the gas passage is provided with a gas main valve, wherein the air main valve and the gas main valve can be selectively opened.

[0019] Preferably, there are at least two first pressure regulating valves in the compressed air passage.

[0020] Compared with the prior art, the advantages of this utility model are as follows: by replacing gas with compressed air, the first pressure regulating valve can be adjusted according to the real-time detection results of the air flow meter, so that the difference between the real-time detection result of the air flow meter and the theoretical value of the compressed air flow is less than the preset value. Therefore, the heat load of the gas water heater can be determined without gas combustion. In addition, the compressed air flow is converted into gas flow, so the opening of the gas proportional valve can be adjusted according to the converted gas flow to make the gas water heater reach the determined heat load. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the gas passage and compressed air passage in an embodiment of this utility model;

[0022] Figure 2 This is a schematic diagram of the circulating water circuit in an embodiment of this utility model. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0024] like Figure 1 and Figure 2 As shown, the gas water heater detection system in this embodiment includes a gas passage 1, a compressed air passage 2, and a circulating water passage 5. The gas passage 1 is connected to the gas inlet 1a of the gas water heater, and the gas water heater is equipped with a gas proportional valve. The compressed air passage 2 is connected to the gas inlet 1a of the gas water heater, and both the compressed air passage 2 and the gas passage 1 can be selectively opened. The circulating water passage 5 includes an inlet connector 51 connected to the water inlet 1b of the gas water heater and an outlet connector 52 connected to the water outlet 1c of the gas water heater. The inlet connector 51 and the outlet connector 52 are connected.

[0025] The compressed air passage 2 is equipped with a first pressure regulating valve 21 and an air flow meter 22 for detecting simulated air flow. The air flow meter 22 is located downstream of the first pressure regulating valve 21. In this embodiment, there are at least two first pressure regulating valves 21. Figure 1 As shown, the compressed air passage 2 is also equipped with an air dual unit 24 (composed of a filter 241 and a pressure regulating valve) and a first valve 25, and the compressed air passage 2 is equipped with an air main valve 23.

[0026] The gas passage 1 is equipped with a main gas valve 510, and the main air valve 23 and the main gas valve 510 can be selectively opened. The gas passage 1 is also connected to a detection passage 6, which is connected to an ignition gun used for open flame detection of gas water heater leaks. In this embodiment, the detection passage 6 is equipped with a second pressure regulating valve 61 and a control valve 62.

[0027] The circulating water circuit 5 is equipped with a flow regulating valve 53, a water flow meter 54, a first temperature detection unit 55 located near the inlet connector 51, and a second temperature detection unit 56 located near the outlet connector 52. The first temperature detection unit 55 is used to detect the inlet water temperature, and the second temperature detection unit 56 is used to detect the outlet water temperature. The circulating water circuit 5 is also equipped with at least one high-pressure inlet valve 57, at least one pressure gauge 58 for detecting the pressure on the circulating water circuit 5, and a pressure relief valve 59 for releasing pressure. In this embodiment, both the first temperature detection unit 55 and the second temperature detection unit 56 are thermometers. The circulating water circuit 5 is also equipped with an expansion tank 71 and a second valve 72 (in this embodiment, the second valve 72 is a needle valve). The various components on the circulating water circuit 5 are provided to ensure safety during the water heating process, and they are all components known to those skilled in the art. The working process of each component will not be described in detail here.

[0028] The gas water heater detection system in this embodiment also includes a controller 3, which is electrically connected to the first pressure regulating valve 21, the air flow meter 22, the gas proportional valve, the flow pressure regulating valve 53, the water flow meter 54, the first temperature detection unit 55, and the second temperature detection unit 56.

[0029] On the one hand, in order to determine the heat load of the water heater, the controller 3 is configured to: adjust the first pressure regulating valve 21 according to the real-time detection result of the air flow meter 22, so that the difference between the real-time detection result of the air flow meter 22 and the theoretical value of the compressed air flow is less than a preset value, and when the difference between the real-time detection result of the air flow meter 22 and the theoretical value of the compressed air flow is less than the preset value, the controller 3 can adjust the opening of the gas proportional valve according to the real-time detection result of the air flow meter 22; the calculation of the theoretical value of the compressed air flow in this embodiment can refer to the prior application of the applicant, application number CN202410. The formula disclosed in Chinese invention patent 205425.X (application publication number CN118150205A), entitled "A Test Method for Simulated Air Flow Regulation," states that when the difference between the real-time detection result of the air flow meter 22 and the theoretical value of the compressed air flow is less than a preset value, it indicates that the compressed air flow at this time can enable the water heater to achieve the rated heat load. The actual gas flow can be obtained by using the calculation formula between compressed air flow and gas flow. The opening degree of the gas proportional valve can then be adjusted according to the gas flow (this adjustment of the opening degree is prior art and will not be elaborated here).

[0030] On the other hand, in order to quickly detect whether the hot water output rate is qualified, during the gas water heater combustion leak detection process, combustion is carried out according to the set heat load (that is, the gas proportional valve is opened according to the opening degree calculated above). Based on the set inlet and outlet water temperatures and rated thermal efficiency, the water flow rate is calculated according to the formula for hot water output rate (the calculation of hot water output rate can refer to the content disclosed in Chinese invention patent "A Safety Control Method, Device and Water Heater for a Water Heater" with patent number ZL201810172095.3 (authorization announcement number CN108317738B), which corresponds to: calculating the product of the outlet water temperature difference and the water flow velocity to determine the hot water output rate of the water heater). By comparing the actual detection value of the water flow meter 54 with the calculated outlet water flow rate, it is possible to quickly determine whether the hot water output rate of the gas water heater is qualified.

[0031] Of course, if it is necessary to calculate the actual hot water output of the gas water heater, combustion can be carried out according to the set heat load (i.e., the gas proportional valve is opened according to the opening degree calculated above), and the actual water flow rate detected by the water flow meter 54, the inlet water temperature detected by the first temperature detection unit 55, and the outlet water temperature detected by the second temperature detection unit 56 can be used for calculation. First, calculate the difference between the outlet water temperature detected by the second temperature detection unit 56 and the inlet water temperature detected by the first temperature detection unit 55, and then multiply the difference by the actual water flow rate detected by the water flow meter 54 to obtain the actual hot water output of the gas water heater.

[0032] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A gas water heater detection system, comprising: A gas passage (1) is connected to the gas inlet (1a) of a gas water heater, and a gas proportional valve is provided inside the gas water heater; Its features also include: The compressed air passage (2) is connected to the air inlet (1a) of the gas water heater. The compressed air passage (2) and the gas passage (1) can be opened selectively. The compressed air passage (2) is provided with a first pressure regulating valve (21) and an air flow meter (22) for detecting simulated air flow. The air flow meter (22) is located downstream of the first pressure regulating valve (21). The controller (3) is electrically connected to the first pressure regulating valve (21), the air flow meter (22), and the gas proportional valve. The controller (3) is configured to adjust the first pressure regulating valve (21) according to the real-time detection result of the air flow meter (22) so that the difference between the real-time detection result of the air flow meter (22) and the theoretical value of the compressed air flow is less than a preset value. When the difference between the real-time detection result of the air flow meter (22) and the theoretical value of the compressed air flow is less than the preset value, the controller (3) can adjust the opening of the gas proportional valve according to the real-time detection result of the air flow meter (22).

2. The gas water heater detection system according to claim 1, characterized in that: It also includes a circulating water path (5), which includes an inlet connector (51) connected to the inlet (1b) of the gas water heater and an outlet connector (52) connected to the outlet (1c) of the gas water heater. The inlet connector (51) and the outlet connector (52) are connected. The circulating water path (5) is equipped with a flow regulating valve (53) and a water flow meter (54). The flow regulating valve (53) and the water flow meter (54) are both electrically connected to the controller (3).

3. The gas water heater detection system according to claim 2, characterized in that: The circulating water path (5) is also provided with a first temperature detection unit (55) located near the water inlet connector (51) and a second temperature detection unit (56) located near the water outlet connector (52). The first temperature detection unit (55) is used to detect the water inlet temperature, and the second temperature detection unit (56) is used to detect the water outlet temperature.

4. The gas water heater detection system according to claim 3, characterized in that: At least one high-pressure inlet valve (57) is also provided on the circulating water circuit (5).

5. The gas water heater detection system according to claim 2, characterized in that: At least one pressure gauge (58) is provided on the circulating water path (5) for detecting the pressure on the circulating water path (5).

6. The gas water heater detection system according to claim 5, characterized in that: The circulating water circuit (5) is also equipped with a pressure relief valve (59) for pressure relief.

7. The gas water heater testing system according to any one of claims 1 to 6, characterized in that: It also includes a detection passage (6) connected to the gas passage (1), the detection passage (6) being connected to an ignition gun for detecting whether the gas water heater is leaking with an open flame.

8. The gas water heater detection system according to claim 7, characterized in that: The detection path (6) is equipped with a second pressure regulating valve (61) and a control valve (62).

9. The gas water heater testing system according to any one of claims 1 to 6, characterized in that: An air main valve (23) is provided on the compressed air passage (2), and a gas main valve (510) is provided on the gas passage (1). The air main valve (23) and the gas main valve (510) can be opened selectively.

10. The gas water heater detection system according to claim 9, characterized in that: There are at least two first pressure regulating valves (21) on the compressed air passage (2).

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