Heating and ventilation device and heat source circuit thereof

Abstract

The utility model discloses a heating and ventilation device and a heat source circuit thereof, and relates to the technical field of heating equipment, the heat source circuit comprises a main heat circuit and an auxiliary heat circuit, the main heat circuit comprises a heat pump circuit and a heat pump control switch group, the heat pump control switch group is connected with the heat pump circuit in series, and the auxiliary heat circuit is connected with the auxiliary heat circuit. Under the condition that all switches in the heat pump control switch group are switched on, the heat pump circuit is switched on; the auxiliary heating circuit is connected with the main heating circuit in parallel, the auxiliary heating circuit comprises an electric heating circuit and an electric heating control switch group, and under the condition that the heat pump circuit is conducted and switches in the electric heating control switch group are all closed, the electric heating circuit is conducted. The technical scheme provided by the utility model aims to solve the technical problem that the electric heating tube in the heat source circuit of the existing heating and ventilation device is easy to burn out.

Description

TECHNICAL FIELD

[0001] The utility model relates to a heating equipment technical field, concretely relates to a heating and ventilation device and heat source circuit thereof. BACKGROUND

[0002] Heat pump heating is a kind of heating mode using heat pump technology, however, in extremely low temperature condition, the heating capacity of heat pump can be reduced, because the heat energy of low temperature heat source reduces, the working efficiency of heat pump also reduces. At this time, the electric heating pipe as auxiliary heat source is usually used in related technology to supplement the deficiency of heat pump.

[0003] But the working logic of heat pump and electric heating pipe is controlled by software in related technology, and the realization of control logic needs time to process, cannot disconnect electric heating pipe in time when heat pump failure, water blockage and other problems occur, and because electric heating power is high, current is large, if electric heating pipe cannot disconnect in time, still continues to work, can cause the water flow in pipeline to reduce or stop, lead to not enough water flow to take away the heat of electric heating pipe, and electric heating pipe can be damaged due to dry burning and overheating. CONTENT OF UTILITY MODEL

[0004] The utility model discloses a kind of heating and ventilation device and heat source circuit thereof, to solve the technical problem that electric heating pipe is easy to burn in the heat source circuit of existing heating and ventilation device.

[0005] To achieve the above-mentioned purpose, in the first aspect, the utility model provides a heat source circuit, the heat source circuit includes: main heating circuit, the main heating circuit includes heat pump circuit and heat pump control switch group, the heat pump control switch group is connected in series with the heat pump circuit, under the condition that the switch in the heat pump control switch group is all closed, the heat pump circuit is conducted; Auxiliary heating circuit, the auxiliary heating circuit is connected in parallel with the main heating circuit, the auxiliary heating circuit includes electric heating circuit and electric heating control switch group, under the condition that the heat pump circuit is conducted and the switch in the electric heating control switch group is all closed, the electric heating circuit is conducted.

[0006] Preferably, the heat pump circuit includes the first power supply branch formed by the first power supply end and the heat pump, and the second power supply branch formed by the second power supply end and the heat pump; The heat pump control switch group includes a first switch and a second switch connected in series, the first switch and the second switch each include a coil part and a contact part, and the coil part and the contact part are coupled and connected; The two ends of the contact part of the first switch are connected to the coil part of the second switch and the second switch respectively, and the coil part of the second switch is further connected to the second power supply branch through a second node, and the second node is any point on the second power supply branch; Wherein, the contact part of the second switch is arranged on the first power supply branch.

[0007] Preferably, the electric heating control switch group is connected with the first power supply branch of the heat pump circuit through a first node, which is any point on the line between the contact part of the second switch and the heat pump; and the electric heating control switch group is connected with the second power supply branch of the heat pump circuit through a second node.

[0008] Preferably, the electric heating circuit comprises a third power supply branch formed by connecting a first power supply end with the electric heating pipe, and a fourth power supply branch formed by connecting a second power supply end with the electric heating pipe; and the electric heating control switch group comprises a third switch, which comprises a coil part and a contact part coupled together, and the contact part of the third switch is arranged on the third power supply branch.

[0009] Preferably, the electric heating control switch group further comprises a fourth switch and a fifth switch, both of which comprise a coil part and a contact part coupled together, and the contact part of the fourth switch is connected with the contact part of the fifth switch at both ends, and the coil part of the third switch is connected with the contact part of the fifth switch at both ends.

[0010] Preferably, the coil part of the fifth switch is arranged in the pipeline of the heating and ventilation device, and the switching state of the fifth switch is determined by the water flow condition in the pipeline of the heating and ventilation device.

[0011] Preferably, the fifth switch comprises a water flow switch, the type of the water flow switch is a normally open type switch, and the fifth switch is in a closed state when there is water flow in the pipeline of the heating and ventilation device, and is in an open state when there is no water flow in the pipeline of the heating and ventilation device.

[0012] Preferably, the switching types of the second switch and the third switch of the heat source circuit comprise contactors.

[0013] Preferably, the types of the first switch and the fourth switch of the heat source circuit comprise relays, and the first switch and the fourth switch are arranged on the control panel of the heating and ventilation device.

[0014] In the second aspect, the utility model provides a kind of heating and ventilation device, the heating and ventilation device includes circuit board and the heat source circuit of any one of the first aspect, the heat source circuit is integrated on the circuit board, the heat pump of the heat source circuit and the electric heating pipe are arranged in pipeline, and the heat pump and the electric heating pipe are connected with the circuit board, wherein the two ends of the heat pump are connected with first power supply branch and second power supply branch respectively, and the two ends of the electric heating pipe are connected with third power supply branch and fourth power supply branch respectively.

[0015] The utility model discloses technical scheme, heat source circuit includes main heat circuit and auxiliary heat circuit, and main heat circuit is the power supply of heat pump, and further through the water of heat pump heating pipeline, provides main heat source, and auxiliary heat circuit is the power supply of electric heating pipe, and further through electric heating pipe to heat the water in the pipeline, provides auxiliary heat source. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, obviously, the drawings in the following description only some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, can also obtain other drawings according to the structure shown in these drawings.

[0017] Figure 1 To show the circuit diagram of the heat source circuit provided by the embodiment of the application.

[0018] The realization, functional characteristics and advantages of the utility model will be further described with reference to the drawings by combining the embodiments. DETAILED DESCRIPTION

[0019] The technical scheme in the embodiments of the utility model will be clearly and completely described by combining the drawings in the embodiments of the utility model, obviously, the described embodiments only some embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0020] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0021] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0022] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixing" and the like should be broadly understood, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0024] In the related art, the control mode of auxiliary heat pump heating by electric heating pipe is controlled by software signal, for example, signals are provided to heat pump circuit and electric heating pipe circuit to execute heating action at the same time, when heat pump failure, water blockage and other events occur, control signal is generated according to fault information and sent to electric heating pipe circuit again, and the electric heating pipe is controlled to be disconnected. This series of signal processing process needs time, and the reaction to the fault exists delay, which may cause no water flow in the heating water pipe, so that the electric heating pipe is dry and overheated, resulting in damage.

[0025] Based on the above reasons, the utility model provides a kind of heat source circuit, including main heat circuit and auxiliary heat circuit, main heat circuit is powered for heat pump, and then the water in pipeline is heated by heat pump, provides main heat source, auxiliary heat circuit is powered for electric heating tube, and then the water in pipeline is heated by electric heating tube, provides auxiliary heat source.It is where, main heat circuit includes heat pump circuit and heat pump control switch group, heat pump control switch group is used to control heat pump circuit, in the case where the switch in heat pump control switch group is all closed, heat pump circuit is conducted.Auxiliary heat circuit includes electric heating circuit and electric heating control switch group, electric heating control switch group is used to control electric heating circuit, wherein, only in the case where heat pump circuit is conducted and the switch in electric heating control switch group is all closed, electric heating circuit is conducted.So, the hardware control of main heat circuit and auxiliary heat circuit can be realized directly by circuit structure, circuit is controlled directly by switch group, need not software control, can improve the reaction capability of circuit, and only in the case where heat pump circuit is conducted and the switch in electric heating control switch group is all closed, electric heating circuit is conducted, on the one hand, only in the case where main heat circuit is normal, auxiliary heat circuit is started, to prevent auxiliary heat circuit from dry burning when heat pump fails;On the other hand, the independent control of auxiliary heat circuit can be realized, and the reliability of circuit can be greatly improved.The heat source circuit structure of the embodiment is simple, and the cost is low.

[0026] Specifically, Figure 1 The circuit diagram of the heat source circuit of the embodiment is shown as Figure 1 The heat source circuit of the embodiment includes main heat circuit and auxiliary heat circuit, and the main heat circuit includes heat pump circuit 10 and heat pump control switch group, and the heat pump control switch group is connected in series with the heat pump circuit 10.

[0027] The heat pump circuit 10 is connected with 220V power supply voltage and heat pump PUMP to form a power supply path from the power supply voltage to the PUMP.

[0028] The auxiliary heat circuit is connected in parallel with the main heat circuit, and the auxiliary heat circuit includes electric heating circuit 11 and electric heating control switch group.

[0029] It should be noted that the electric heating circuit 11 of the embodiment is only turned on when the heat pump circuit 10 is turned on and the switches in the electric heating control switch group are all closed. The heat pump circuit 10 is turned on as a prerequisite for the electric heating circuit 11 to be turned on, so that the auxiliary heating is only started when the heat pump is working normally, preventing the electric heating tube from working when the heat pump fails. The switches in the electric heating control switch group are all closed as a prerequisite for the electric heating circuit 11 to be turned on, so that the auxiliary heating switch can be controlled separately, improving the reliability of the circuit.

[0030] In the embodiment, the heat pump circuit 10 includes a first power supply branch formed by connecting the first power supply end L and the heat pump PUMP, and a second power supply branch formed by connecting the second power supply end N and the heat pump PUMP; the heat pump control switch group includes the first switch PUMP_KA1 and the second switch KM1 arranged in series, and the first switch PUMP_KA1 and the second switch KM1 each include a coil part and a contact part, and the coil part and the contact part are coupled and connected, and when the coil part is powered, the contact part is closed, and the first switch PUMP_KA1 and the second switch KM1 are in a conductive state.

[0031] The two ends of the contact part of the first switch PUMP_KA1 are respectively connected to the first power supply end L and the coil part of the second switch KM1, and the coil part of the second switch KM1 is further connected to the second power supply branch through the second node B, and the second node B is any point on the second power supply branch, and thus a control loop of the first power supply end L, the first switch PUMP_KA1, the second switch KM1 and the second power supply end N can be formed,

[0032] In the embodiment, the contact part of the second switch KM1 is arranged on the first power supply branch, so that when the coil part of the second switch KM1 is powered and the contact part of the second switch KM1 is closed, the first power supply branch formed by connecting the first power supply end L and the heat pump PUMP can be turned on, and the heat pump starts to work.

[0033] In the embodiment, the switch state of the second switch KM1 is consistent with the switch state of the first switch PUMP_KA1, that is, when the first switch PUMP_KA1 is closed, the second switch KM1 is closed, and when the first switch PUMP_KA1 is disconnected, the second switch KM1 is disconnected, so that when the first switch PUMP_KA1 is controlled to be closed, the second switch KM1 is closed, the first power supply branch formed by connecting the first power supply end L and the heat pump PUMP is turned on, and the heat pump starts to work.

[0034] In one example, the first switch PUMP_KA1 is arranged on the control panel 12, and thus the user can operate conveniently, and the second switch KM1 is a contactor switch of the heat pump, so that when the user controls the first switch PUMP_KA1 to be closed, the contactor coil of the heat pump is powered, and the second switch KM1 is closed.

[0035] Through the above embodiment, the power-on control of the main heating circuit can be realized, and when the heat pump fails, the heat pump can be quickly controlled to stop working through the first switch, and the structure is simple and the cost is low.

[0036] In this embodiment, the electric heating control switch group is connected with the first power supply branch of the heat pump circuit through the first node A, and the first node A is any point on the line between the contact part of the second switch KM1 and the heat pump PUMP; the electric heating control switch group is connected with the second power supply branch of the heat pump circuit through the second node B, and the second node B is any point on the line between the second power supply end and the heat pump PUMP.

[0037] As shown in Figure 1 The circuit where the electric heating control switch group is located is connected with the first power supply branch and the second power supply branch through the first node A and the second node B respectively to connect the 220V power supply voltage.

[0038] The first node A is located on the line between the contact part of the second switch KM1 and the heat pump PUMP, so that the first node A is connected with the first power supply end L only when the second switch KM1 is closed and the first power supply branch is turned on, and then the circuit where the electric heating control switch group is located is connected with the 220V power supply voltage, providing a power supply basis for subsequent control.

[0039] In this embodiment, the electric heating circuit 11 includes a third power supply branch formed by connecting the first power supply end L with the electric heating tube HTG, and a fourth power supply branch formed by connecting the second power supply end N with the electric heating tube HTG, so that the electric heating circuit 11 can provide working voltage for the electric heating tube HTG.

[0040] The electric heating control switch group includes a third switch KM2, and the third switch KM2 also includes a coil part and a contact part coupled together, and for the same reason, when the coil part of the third switch KM2 is powered, the contact part of the third switch KM2 is closed.

[0041] The contact part of the third switch KM2 is arranged on the third power supply branch, so that the working of the electric heating circuit 11 can be controlled through the third switch KM2, and in the case that the third switch KM2 is closed, the electric heating circuit 11 is turned on to provide working voltage for the electric heating tube HTG, and in the case that the third switch KM2 is disconnected, the electric heating circuit 11 is disconnected and the electric heating tube HTG stops working.

[0042] In the embodiment, the electric heating control switch group further comprises a fourth switch HTG_KA2 and a fifth switch F, both of which comprise a coil part and a contact part coupled together. Similarly, when the coil part of the fourth switch HTG_KA2 is powered, the contact part of the fourth switch HTG_KA2 is closed. When the coil part of the fifth switch F is powered, the contact part of the fifth switch F is closed.

[0043] In the embodiment, the two ends of the contact part of the fourth switch HTG_KA2 are connected to the first node A and the contact part of the fifth switch F respectively, and the two ends of the coil part of the third switch KM2 are connected to the second node B and the contact part of the fifth switch F respectively. Further, the first node A, the fourth switch HTG_KA2, the fifth switch F, the third switch KM2 and the second node B can form an electric heating control loop.

[0044] In the embodiment, the fourth switch HTG_KA2 can control the conduction state of the third switch KM2, i.e., the switch state of the third switch KM2 is consistent with the switch state of the fourth switch HTG_KA2. When the fourth switch HTG_KA2 is closed, the third switch KM2 is closed. When the fourth switch HTG_KA2 is disconnected, the third switch KM2 is disconnected. In this way, the fourth switch HTG_KA2 is arranged on the control panel 12, and the user can control the electric heating circuit 11 by controlling the closing or disconnection of the fourth switch HTG_KA2. When the fourth switch HTG_KA2 is closed, the third switch KM2 is closed, the third supply branch formed by connecting the first power supply end L and the electric heating tube HTG is conducted, and the electric heating tube HTG starts to work.

[0045] In the embodiment, the switch types of the second switch KM1 and the third switch KM2 include contactors. In this way, the second switch KM1 and the third switch KM2 both comprise a coil part and a contact part (switch contact). When the coil part is powered, the contact part is closed. Figure 1 As shown in FIG. 2, the coil part of the second switch KM1 is connected in series between the contact part of the first switch PUMP_KA1 and the second node B, and the contact part of the second switch KM1 is connected in series between the first power supply end L of the first supply branch and the heat pump. When the contact part of the first switch PUMP_KA1 is closed, the coil part of the second switch KM1 is powered, and the contact part of the second switch KM1 is closed, the first supply branch is conducted.

[0046] The coil part of the third switch KM2 is connected in series between the contact part of the fourth switch HTG_KA2 and the second node B, and the contact part of the third switch KM2 is connected in series between the first power supply end L of the third supply branch and the electric heating tube HTG. When the contact part of the fourth switch HTG_KA2 is closed, the coil part of the third switch KM2 is powered, and the contact part of the third switch KM2 is closed, the third supply branch is conducted.

[0047] In the embodiment, the first switch PUMP_KA1 and the fourth switch HTG_KA2 are both relay switches, and are arranged on the control panel 12 of the HVAC device, so as to be convenient for the user to control.

[0048] In the embodiment, the fifth switch F is connected in series between the contact part of the third switch KM2 and the coil part of the fourth switch HTG_KA2, so as to further control the working of the electric heating pipe when the third switch KM2 and the fourth switch HTG_KA2 are closed. The coil part of the fifth switch F is arranged in the pipeline of the HVAC device, and the working state of the electric heating pipe is determined by the water flow in the pipeline of the HVAC device, that is, the working state of the electric heating pipe is determined by the water flow in the pipeline of the HVAC device. In this way, the electric heating pipe can be stopped from working when the water flow in the pipeline is insufficient, and the electric heating pipe can be made to work when the water flow in the pipeline is sufficient, so as to prevent the electric heating pipe from being dry-burned.

[0049] In the embodiment, the fifth switch F is a water flow switch, and the type of the water flow switch is an output normally open switch. The fifth switch F is in a closed state when there is water flow in the pipeline of the HVAC device, and is in an open state when there is no water flow in the pipeline of the HVAC device.

[0050] The type of the water flow switch is an output normally open switch. When there is no water flow through the pipeline, the output end of the water flow switch is open, and the electric heating pipe is stopped from working. When there is water flow, the output end of the water flow switch is closed, and the electric heating pipe works.

[0051] In combination with Figure 1 The circuit control logic of the present application is described as follows:

[0052] When the contact part of the first switch PUMP_KA1 is closed, the coil part of the second switch KM1 is electrified, the contact part of the second switch KM1 is closed, the first power supply branch is turned on, and the heat pump starts to work. When there is water flow in the pipeline, the fifth switch F is closed. Since the first power supply branch is turned on, the first node A is electrified. By controlling the contact part of the fourth switch HTG_KA2 to be closed, the coil part of the third switch KM2 is electrified, the contact part of the third switch KM2 is closed, the fourth switch HTG_KA2, the third switch KM2 and the fifth switch F are closed, the circuit is turned on, and the third power supply branch is turned on due to the closing of the third switch KM2, so that the electric heating pipe starts to work.

[0053] When there is no water flow in the pipeline, the fifth switch F is open, and no matter whether the fourth switch HTG_KA2 is closed or not, the circuit in which the fourth switch HTG_KA2, the third switch KM2 and the fifth switch F are closed is all open, the third switch KM2 cannot be closed, the third power supply branch is open, and the electric heating pipe does not work.

[0054] The first switch PUMP_KA1 is controlled to be off, the second switch KM1 is controlled to be off, the fourth switch HTG_KA2, the third switch KM2 and the fifth switch F are controlled to be closed, and the circuit cannot be powered on. Regardless of whether the fourth switch HTG_KA2, the third switch KM2 and the fifth switch F are closed, the electric heating tube does not work.

[0055] The heat source circuit provided in the above embodiment includes a main heat circuit and an auxiliary heat circuit. The main heat circuit includes a heat pump circuit 10 and a heat pump control switch group, and the heat pump control switch group is used to control the heat pump circuit 10. When the switches in the heat pump control switch group are all closed, the heat pump circuit 10 is turned on. The auxiliary heat circuit includes an electric heating circuit 11 and an electric heating control switch group, and the electric heating control switch group is used to control the electric heating circuit 11. Only when the heat pump circuit 10 is turned on and the switches in the electric heating control switch group are all closed, the electric heating circuit 11 is turned on. In this way, the hardware control of the main heat circuit and the auxiliary heat circuit can be directly realized through the circuit structure, the circuit is directly controlled through the switch group, and software control is not needed, so that the reaction capability of the circuit can be improved. Moreover, only when the heat pump circuit 10 is turned on and the switches in the electric heating control switch group are all closed, the electric heating circuit 11 is turned on. On the one hand, this can realize that the auxiliary heat circuit is started only when the main heat circuit works normally, so that the auxiliary heat circuit is prevented from being dry-burned when the heat pump fails. On the other hand, the auxiliary heat circuit can be controlled independently, so that the reliability of the circuit can be greatly improved. Moreover, the heat source circuit provided in the embodiment has a simple structure and low cost. Moreover, through the water flow switch, the working state of the electric heating tube can be determined according to the water flow in the pipeline of the heating and ventilation device. In this way, when the water flow in the pipeline is insufficient, the electric heating tube stops working. When the water flow in the pipeline is sufficient, the electric heating tube works, so that the electric heating tube is prevented from being dry-burned.

[0056] The embodiment of the present application provides a heating and ventilation device. The heating and ventilation device includes a circuit board and the heat source circuit provided in the above embodiment. The heat source circuit is integrated on the circuit board. The heat pump and the electric heating tube are arranged in a pipeline. The heat pump and the electric heating tube are connected with the circuit board. The two ends of the heat pump are connected with the first power supply branch and the second power supply branch respectively. The two ends of the electric heating tube are connected with the third power supply branch and the fourth power supply branch respectively.

[0057] Specifically, the heat source circuit includes a main heat circuit and an auxiliary heat circuit. The main heat circuit includes a heat pump circuit 10 and a heat pump control switch group. The heat pump control switch group is connected with the heat pump circuit 10 in series. When the switches in the heat pump control switch group are all closed, the heat pump circuit 10 is turned on. The auxiliary heat circuit is connected with the main heat circuit in parallel. The auxiliary heat circuit includes an electric heating circuit 11 and an electric heating control switch group. When the heat pump circuit 10 is turned on and the switches in the electric heating control switch group are all closed, the electric heating circuit 11 is turned on. The heat source circuit is the heat source circuit as shown in FIG. 10. Figure 1 ​

[0058] The heating device of the embodiment has the same inventive concept as the heat source circuit, and has the same effect as the heat source circuit.

[0059] The above is only the preferred embodiment of the present application, and does not limit the patent range of the present application, and any equivalent structural transformation made by using the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection range of the present application.

Claims

1. A heat source circuit characterized by comprising: The heat source circuit comprises: a main heat circuit comprising a heat pump circuit and a heat pump control switch group, the heat pump control switch group being connected in series with the heat pump circuit, and the heat pump circuit being turned on when the switches in the heat pump control switch group are all closed; an auxiliary heat circuit connected in parallel with the main heat circuit, the auxiliary heat circuit comprising an electric heating circuit and an electric heating control switch group, and the electric heating circuit being turned on when the heat pump circuit is turned on and the switches in the electric heating control switch group are all closed.

2. The heat source circuit of claim 1, wherein the heat pump circuit comprises a first power supply branch formed by connecting a first power supply end with a heat pump, and a second power supply branch formed by connecting a second power supply end with the heat pump; the heat pump control switch group comprises a first switch and a second switch connected in series, the first switch and the second switch each comprising a coil part and a contact part, and the coil part and the contact part being coupled and connected; the contact part of the first switch has two ends connected to the first power supply end and the coil part of the second switch, respectively, and the coil part of the second switch is further connected to the second power supply branch through a second node, the second node being any point on the second power supply branch; wherein the contact part of the second switch is arranged on the first power supply branch.

3. The heat source circuit of claim 1, wherein the electric heating control switch group is connected to the first power supply branch of the heat pump circuit through a first node, the first node being any point on a line between the contact part of the second switch and the heat pump; the electric heating control switch group is connected to the second power supply branch of the heat pump circuit through a second node.

4. The heat source circuit of any one of claims 1 or 3, wherein the electric heating circuit comprises a third power supply branch formed by connecting a first power supply end with an electric heating tube, and a fourth power supply branch formed by connecting a second power supply end with the electric heating tube; the electric heating control switch group comprises a third switch, the third switch comprising a coil part and a contact part coupled and connected, and the contact part of the third switch being arranged on the third power supply branch.

5. The heat source circuit according to claim 4, wherein the electric heating control switch group further comprises a fourth switch and a fifth switch, the fourth switch and the fifth switch each comprising a coil part and a contact part coupled and connected, and the contact part of the fourth switch having two ends connected to the first node and the contact part of the fifth switch, respectively, the coil part of the third switch having two ends connected to the second node and the contact part of the fifth switch, respectively.

6. The heat source circuit according to claim 5, wherein the coil part of the fifth switch is arranged in a pipeline of a heating and ventilation device, and the switching state of the fifth switch is determined by the water flow condition in the pipeline of the heating and ventilation device.

7. The heat source circuit according to claim 6, wherein the fifth switch comprises a water flow switch, the type of the water flow switch being an output normally open switch, and the fifth switch being in a closed state when there is water flow in the pipeline of the heating and ventilation device, and being in an open state when there is no water flow in the pipeline of the heating and ventilation device.

8. The heat source circuit according to claim 1, wherein the switching types of the second switch and the third switch of the heat source circuit comprise contactors.

9. The heat source circuit according to claim 1, wherein The types of the first switch and the fourth switch of the heat source circuit include relays, and the first switch and the fourth switch are arranged on a control panel of the heating and ventilation device.

10. A heating and ventilation device, characterized in that The heating and ventilation device comprises a circuit board and the heat source circuit according to any one of claims 1-9, and the heat source circuit is integrated on the circuit board. The heat pump and the electric heating pipe of the heat source circuit are arranged in a pipe, and the heat pump and the electric heating pipe are connected with the circuit board, wherein two ends of the heat pump are connected with a first power supply branch and a second power supply branch respectively, and two ends of the electric heating pipe are connected with a third power supply branch and a fourth power supply branch respectively.

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