Plate heat exchanger set having monitoring switching function

Abstract

The present invention relates to the technical field of plate heat exchangers, and specifically relates to a plate heat exchanger set having a monitoring switching function. The plate heat exchanger set comprises a heat exchanger unit, which comprises two heat exchanger bodies arranged side by side, wherein each heat exchanger body is provided with a plurality of water ports, and a communicating tube is provided at the water ports of the two adjacent heat exchanger bodies to connect the corresponding two water ports. When the discharged hot water is not hot, a temperature measuring element feeds back the measured temperature to a monitoring center, while a temperature sensing element deforms and allows the temperature measuring element to descend deep into a hot-water output pipe to further perform more accurate real-time monitoring, and the descent of the temperature measuring element also drives a second gear to rotate by means of a gear and rack set. In this way, the temperature measuring element moves upward, while the second gear drives, by means of a toothed belt, first gears to rotate such that three-way valves are switched, so as to implement fully automatic and smooth switching between the two heat exchanger bodies, thus ensuring continued heating.

Description

A plate heat exchanger group with monitoring switching function Technical Field

[0001] The present invention relates to the technical field of plate heat exchangers, and in particular to a plate heat exchanger group with a monitoring and switching function. Background Art

[0002] The current plate heat exchanger end differential monitoring system in the heating network is relatively general and cannot monitor the performance of each plate heat exchanger in real time. This system can only assess overall operational effectiveness and cannot accurately monitor the performance of individual heat exchangers. Therefore, during the heating period, the operation and maintenance team must measure the supply and return water temperatures of each plate heat exchanger on-site, both in the primary and secondary networks. However, since the heat exchange stations are geographically dispersed throughout the urban area, measuring data over such a long distance would waste supporting resources and hinder real-time monitoring.

[0003] Furthermore, if a heat exchanger fails and cannot be repaired or replaced in time, it can cause problems for the entire heating system. Therefore, it is necessary to design a heat exchanger bank with a timely switchover function. This way, if one heat exchanger fails, the system can automatically switch to the backup heat exchanger to ensure continuous heating.

[0004] To address these issues, consider upgrading the heat exchange station monitoring system, using more advanced equipment and technology to enable real-time monitoring of each plate heat exchanger. Furthermore, the design of the heat exchanger bank should consider switching between backup and primary heat exchangers to address failures or maintenance needs, ensuring reliable operation of the heat network. Such upgrades will improve the efficiency and stability of the heat network.

[0005] Summary of the Invention

[0006] In view of the above-mentioned problems existing in the existing plate heat exchanger group with monitoring switching function, the present invention is proposed.

[0007] Therefore, the present invention aims to provide a plate heat exchanger group with a monitoring and switching function, which aims to promptly detect problems in each plate heat exchanger and switch to a spare plate heat exchanger in a timely manner.

[0008] To solve the above technical problems, the present invention provides the following technical solutions: a plate heat exchanger assembly with a monitoring and switching function, comprising a heat exchanger component, including two heat exchanger bodies arranged in parallel, each of the heat exchanger bodies having a plurality of water outlets, and a connecting pipe provided at the water outlets of two adjacent heat exchanger bodies for connecting the corresponding two water outlets;

[0009] A switching component is installed on the heat exchanger component, which includes a three-way valve installed on each connecting pipe. The three-way valves are connected in series and synchronously controlled by a transmission component. A temperature sensing component and a temperature measuring component are respectively provided on both sides of the three-way valve on one of the connecting pipes. The temperature measuring component is inserted into the temperature sensing component, and the temperature measuring component is connected to the transmission component through a gear rack set, so as to be inserted into the connecting pipe in turn.

[0010] As a preferred solution of the plate heat exchanger group with monitoring and switching function described in the present invention, wherein: the water outlets of each heat exchanger body respectively include a cold water outlet, a cold water inlet, a hot water inlet and a hot water outlet, wherein the connecting pipe connecting the two cold water outlets is a cold water outlet pipe, the connecting pipe connecting the two cold water inlets is a cold water inlet pipe, the connecting pipe connecting the two hot water inlets is a hot water inlet pipe, and the connecting pipe connecting the two hot water outlets is a hot water outlet pipe.

[0011] As a preferred solution of the plate heat exchanger group with monitoring switching function described in the present invention, wherein: the connecting pipes are, from high to low, a cold water outlet pipe, a hot water inlet pipe, a hot water outlet pipe and a cold water inlet pipe, wherein a first three-way valve is provided on the cold water outlet pipe, a second three-way valve is provided on the hot water inlet pipe, a third three-way valve is provided on the hot water outlet pipe and a fourth three-way valve is provided on the cold water inlet pipe.

[0012] As a preferred solution of the plate heat exchanger group with monitoring and switching function described in the present invention, the valve core of each three-way valve is fixedly connected to the rotating shaft of the transmission member, the outer end of the rotating shaft is fixedly connected to the first gear, and the first gears are connected by a toothed belt transmission.

[0013] As a preferred solution of the plate heat exchanger group with monitoring switching function described in the present invention, a mounting bracket is provided on the connecting pipe, a second gear is mounted on the mounting bracket via a bearing, and the second gear is engaged with the toothed belt.

[0014] As a preferred solution of the plate heat exchanger group with monitoring and switching function described in the present invention, two sockets are symmetrically opened on the hot water outlet pipe about the transmission part, and a sleeve of the temperature sensing part is installed in each of the sockets, and the power part is contained in the sleeve.

[0015] As a preferred solution of the plate heat exchanger group with monitoring switching function described in the present invention, the power part is a spring made of nickel-titanium alloy, which restores its original length at high temperature and pushes the temperature measuring part to move outward.

[0016] As a preferred solution of the plate heat exchanger group with monitoring and switching function described in the present invention, the lower end of the temperature measuring element is inserted into the sleeve and slides and rises along the sleeve, and the temperature measuring element and the sleeve are sealed.

[0017] As a preferred solution of the plate heat exchanger group with monitoring switching function described in the present invention, the gear rack group includes a connecting rod fixed to the two temperature measuring components, and a rack fixed to one end of the connecting rod, and the left and right racks are respectively engaged on both sides of the second gear.

[0018] As a preferred solution of the plate heat exchanger group with monitoring switching function described in the present invention, the left and right racks are of different lengths, and both racks are fixed to one end of the connecting rod through their upper ends.

[0019] The beneficial effects of the present invention are as follows: the present invention monitors the hot water discharged from the hot water outlet of the heat exchanger body in real time through the temperature sensing component and the temperature measuring component. When the discharged hot water is not hot, the temperature measuring component feeds back the detected temperature to the monitoring center. At the same time, the temperature sensing component deforms and allows the temperature measuring component to descend deep into the hot water outlet pipe for further and more accurate real-time monitoring. At the same time, the descent of the temperature measuring component drives the second gear to rotate through the gear rack group, which realizes the upward movement of the temperature measuring component. At the same time, the second gear drives each first gear to rotate through the toothed belt, switching each three-way valve, thereby performing fully automatic and smooth switching between the two heat exchanger bodies to ensure continued heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] FIG1 is a schematic diagram of the overall structure of a plate heat exchanger group with a monitoring and switching function according to the present invention.

[0022] FIG2 is a schematic structural diagram of heat exchanger components in a plate heat exchanger group with a monitoring and switching function according to the present invention.

[0023] FIG3 is a schematic diagram of the structure of the switching components in the plate heat exchanger group with the monitoring switching function of the present invention.

[0024] FIG4 is a front view schematic diagram of the structure of a plate heat exchanger group with a monitoring switching function according to the present invention.

[0025] FIG5 is a schematic diagram of the cross-sectional structure along the line AA in FIG4 .

[0026] In the figure: 100, heat exchanger component; 101, heat exchanger body; 102, water inlet; 102a, cold water outlet; 102b, cold water inlet; 102c, hot water inlet; 102d, hot water outlet; 103, connecting pipe; 103a, cold water outlet pipe; 103b, cold water inlet pipe; 103c, hot water inlet pipe; 103d, hot water outlet pipe; 103d-1, jack; 200, switching component; 201, three-way valve; 201a, first three-way valve; 201b, second three-way valve; 201c, third three-way valve; 201d, fourth three-way valve; 201e, valve core; 202, transmission part; 202a, rotating shaft; 202b, first gear; 202c, toothed belt; 202d, mounting bracket; 202e, bearing; 202f, second gear; 203, temperature sensing part; 203a, sleeve; 203b, power part; 204, temperature measuring part; 205, gear rack assembly; 205a, connecting rod; 205b, rack. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0030] Furthermore, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, when describing the embodiments of the present invention, cross-sectional views illustrating device structures may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, the three-dimensional dimensions of length, width, and depth should be included.

[0031] Example 1

[0032] 1 and 2 , which are a first embodiment of the present invention, provide a plate heat exchanger group with a monitoring and switching function, including a heat exchanger component 100, including two heat exchanger bodies 101 arranged in parallel, each heat exchanger body 101 having a plurality of water inlets 102, and a connecting pipe 103 provided at the water inlets 102 of two adjacent heat exchanger bodies 101 for connecting the corresponding two water inlets 102; a switching component 200, mounted on the heat exchanger component 100, including a three-way valve 201 mounted on each connecting pipe 103, the three-way valves 201 being connected in series and synchronously controlled by a transmission member 202, a temperature sensing member 203 and a temperature measuring member 204 being respectively provided on both sides of the three-way valve 201 on one of the connecting pipes 103, the temperature measuring member 204 being inserted into the temperature sensing member 203, and the temperature measuring member 204 being transmission-connected to the transmission member 202 via a gear rack assembly 205, for being inserted into the connecting pipe 103 in turn.

[0033] During use, the present invention monitors the hot water discharged from the hot water outlet 102d of the heat exchanger body 101 in real time through the temperature sensing element 203 and the temperature measuring element 204. When the discharged hot water is not hot, the temperature measuring element 204 feeds back the detected temperature to the monitoring center. At the same time, the temperature sensing element 203 is deformed, and the temperature measuring element 204 is allowed to descend deep into the hot water outlet pipe 103d for further more accurate real-time monitoring. At the same time, the descent of the temperature measuring element 204 drives the second gear 202f to rotate through the gear rack set 205, which realizes the upward movement of the temperature measuring element 204. At the same time, the second gear 202f drives each first gear 202b to rotate through the toothed belt 202c, switching each three-way valve 201, thereby performing fully automatic and smooth switching between the two heat exchanger bodies 101 to ensure continued heating.

[0034] Example 2

[0035] 1 to 4 , a second embodiment of the present invention is shown, which differs from the first embodiment in that: a plate heat exchanger group with a monitoring switching function, wherein each water outlet 102 of each heat exchanger body 101 includes a cold water outlet 102a, a cold water inlet 102b, a hot water inlet 102c, and a hot water outlet 102d, wherein the connecting pipe 103 connecting the two cold water outlets 102a is a cold water outlet pipe 103a, the connecting pipe 103 connecting the two cold water inlets 102b is a cold water inlet pipe 103b, the connecting pipe 103 connecting the two hot water inlets 102c is a hot water inlet pipe 103c, and the connecting pipe 103 connecting the two hot water outlets 102d is a hot water outlet pipe 103d. The connecting pipes 103 are, from high to low, a cold water outlet pipe 103a, a hot water inlet pipe 103c, a hot water outlet pipe 103d and a cold water inlet pipe 103b, wherein a first three-way valve 201a is provided on the cold water outlet pipe 103a, a second three-way valve 201b is provided on the hot water inlet pipe 103c, a third three-way valve 201c is provided on the hot water outlet pipe 103d and a fourth three-way valve 201d is provided on the cold water inlet pipe 103b.

[0036] It should be noted that, taking FIG2 as an example, on the panel of the heat exchanger body 101, the one located in the upper right is the cold water outlet pipe 103a, the one located in the lower right is the cold water inlet pipe 103b, the one located in the upper left is the hot water inlet pipe 103c, and the one located in the lower left is the hot water outlet pipe 103d. The cold water outlets 102a on the left and right heat exchanger bodies 101 are connected in series through the cold water outlet pipe 103a, and a first three-way valve 201a is provided on the cold water outlet pipe 103a between the two cold water outlets 102a; the hot water inlet pipe 103c is connected in series to the hot water inlet pipe 103d. The water inlets 102c are connected in series, and a second three-way valve 201b is provided on the hot water inlet pipe 103c between the two hot water inlets 102c; the hot water outlets 102d on the left and right heat exchanger bodies 101 are connected in series through the hot water outlet pipe 103d, and a third three-way valve 201c is provided on the hot water outlet pipe 103d between the two hot water outlets 102d; the cold water inlets 102b on the left and right heat exchanger bodies 101 are connected in series through the cold water inlet pipe 103b, and a fourth three-way valve 201d is provided on the cold water inlet pipe 103b between the two cold water inlets 102b.

[0037] In this embodiment, during normal use, the heat exchanger body 101 on one side is connected through each three-way valve 201, and the heat exchanger body 101 on this side is used for heat exchange, and then cold water is introduced into the heat exchanger body 101 through the cold water inlet pipe 103b, and hot water is also introduced into the heat exchanger body 101 through the hot water inlet pipe 103c. The hot water and cold water fully exchange heat through the flow channel in the heat exchanger body 101, so that the cold water becomes hot and the hot water becomes cold, and each is discharged from the corresponding hot water outlet pipe 103d and the cold water outlet pipe 103a, realizing a complete heat exchange process.

[0038] The remaining structures are the same as those of Example 1.

[0039] Example 3

[0040] Referring to Figures 2-5, a third embodiment of the present invention is shown. This embodiment differs from the second embodiment in that: a plate heat exchanger assembly with a monitoring and switching function is provided. Two sockets 103d-1 are symmetrically provided on the hot water outlet pipe 103d about the transmission element 202. Each socket 103d-1 is mounted with a sleeve 203a of a temperature sensing element 203, and a power element 203b is contained within the sleeve 203a. The lower end of the temperature sensing element 204 is inserted into the sleeve 203a and slides and rises along the sleeve 203a. The temperature sensing element 204 and the sleeve 203a are sealed. The rack and pinion assembly 205 includes a connecting rod 205a fixed to the two temperature sensing elements 204, and a rack 205b fixed to one end of the connecting rod 205a. The left and right racks 205b are respectively engaged with the second gear 202f. The left and right racks 205b are of different lengths, and both racks 205b are fixed to one end of the connecting rod 205a through their upper ends.

[0041] It should be noted that the two jacks 103d-1 are symmetrically opened on the hot water outlet pipe 103d about the third three-way valve 201c, so that the temperature sensing element 203 in the plugged and fixed jack 103d-1 is also symmetrically arranged about the third three-way valve 201c. When the three-way valve 201 is connected to the heat exchanger body 101 on either side, the temperature sensing element 203 on the hot water outlet pipe 103d on that side senses the hot water, and as the hot water gradually becomes hotter, the spring restores its original length and hardness, and pushes the temperature measuring element 204 above it out of the sleeve 203a. At the same time, as the hot water gradually becomes hotter, the temperature measuring element 204 measures the temperature of the hot water. After being pushed out, the temperature measuring element 204 is used for heat dissipation and cooling of the temperature measuring element 204 on the one hand, and on the other hand, it is used to drive the rack 205b to rise through the temperature measuring element 204.

[0042] It should also be noted that the setting of the sleeve 203a is used to ensure that the lower end of the temperature measuring component 204 can always remain connected with the hot water outlet pipe 103d during the lifting process. On the one hand, it ensures that the temperature measuring component 204 always monitors the temperature inside the hot water outlet pipe 103d. On the other hand, it seals the sleeve 203a. Since the sleeve 203a is connected to the hot water outlet pipe 103d, the hot water outlet pipe 103d is also blocked to prevent liquid from flowing out or seeping out.

[0043] The power component 203b is a spring made of nickel-titanium alloy, which recovers its original length at high temperature and pushes the temperature measuring component 204 to move outward.

[0044] It should be noted that since the nickel-titanium alloy recovers its original shape at high temperatures, when hot water flows in the hot water outlet pipe 103d, the nickel-titanium alloy always maintains its original spring shape, with the maximum overall hardness and tension, which can support the temperature measuring component 204 and prevent it from sliding down and inserting into the hot water outlet pipe 103d for measurement. When a problem occurs with the heat exchanger body 101, cold water flows in the hot water outlet pipe 103d, and the nickel-titanium alloy cannot maintain its original spring strength and tension, causing the temperature measuring component 204 above it to be pressed down, deformed and contracted. The temperature measuring component 204 descends and is inserted into the hot water outlet pipe 103d to measure the temperature of the hot water outlet pipe 103d. At the same time, the descent of the temperature measuring component 204 pulls the second gear 202f to rotate through the connecting rod 205a and the rack 205b. The second gear 202f drives each first gear 202b to rotate through the toothed belt 202c. The rotation of the first gear 202b drives the valve core 201e to rotate, thereby realizing the switching of each three-way valve 201. Furthermore, a counterweight may be provided on the temperature measuring element 204 to increase the downward pressure effect.

[0045] Furthermore, the temperature measuring element 204 is connected to the monitoring center through the network, and the temperature measurement point signal is uploaded to the monitoring center controller through the PLC system in the heat exchange station, so that an automatic alarm function is realized on the screen when the temperature of the plate heat exchanger exceeds the specified value. The heat exchange effect of the plate heat exchanger can be effectively identified through the monitoring screen, and the status of the plate heat exchanger equipment can be monitored online.

[0046] In this embodiment, each three-way valve 201 is first switched to one of the heat exchanger bodies 101. When the heat exchanger body 101 is working normally, hot water flows in the hot water outlet pipe 103d, so that the nickel-titanium alloy returns to its original state and supports the temperature measuring component 204, so that the temperature measuring component 204 on this side is located at the top, and then the lower end of the rack 205b corresponding to the temperature measuring component 204 on this side is engaged with the second gear 202f. At the same time, since the heat exchanger body 101 on the other side is not used, there is no hot water inside the hot water outlet pipe 103d on this side. The nickel-titanium alloy inside softens and shrinks and deforms under the downward pressure of the temperature measuring component 204, so that the temperature measuring component 204 on this side is located at the bottom and inserted into the hot water outlet pipe 103d, and the upper end of the rack 205b corresponding to the temperature measuring component 204 on this side is engaged with the second gear 202f.

[0047] When a normally functioning heat exchanger 101 is damaged, its hot water outlet pipe 103d ceases to discharge hot water. The nickel-titanium alloy inside this pipe loses its strength, causing the temperature measuring element 204 on that side to descend. This element, via the connecting rod 205a and rack 205b, drives the second gear 202f to rotate. The second gear 202f, via the toothed belt 202c, drives each first gear 202b to rotate, switching the three-way valves 201 and enabling and disabling another heat exchanger 101. Simultaneously, the temperature measuring element 204 remotely uploads data to the monitoring center, which dispatches personnel for inspection and repair as appropriate.

[0048] The remaining structures are the same as those of Example 2.

[0049] Example 4

[0050] Referring to Figures 1-5 , a fourth embodiment of the present invention differs from the third embodiment in that it provides a plate heat exchanger assembly with a monitoring and switching function, wherein the valve core 201e of each three-way valve 201 is fixedly connected to the rotating shaft 202a of the transmission member 202. The outer end of the rotating shaft 202a is fixedly connected to a first gear 202b. The first gears 202b are connected to each other via a toothed belt 202c. A mounting bracket 202d is provided on the connecting pipe 103. A second gear 202f is mounted on the mounting bracket 202d via a bearing 202e. The second gear 202f meshes with the toothed belt 202c.

[0051] It should be noted that the first gear 202b is fixed to the valve core 201e of each three-way valve 201 through the rotating shaft 202a, and the first gears 202b are connected in series through the toothed belt 202c to ensure the synchronous rotation of the first gears 202b, and then ensure the synchronous switching of the three-way valves 201, so as to realize the switching between the left and right heat exchanger bodies 101 to ensure smooth heating and avoid affecting the normal heating. It is further coordinated with the gear rack group 205 and the temperature measuring component 204 and the temperature sensing component 203. In this way, when the temperature sensing component 203 changes, the second gear 202f is driven to rotate by the rack 205b, and the second gear 202f drives the first gear 202b to rotate through the toothed belt 202c to realize the synchronous switching of the three-way valves 201.

[0052] The remaining structures are the same as those of Example 3.

[0053] It is important to note that the construction and arrangement of the present application shown in a number of different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without departing substantially from the novel teachings and advantages of the subject matter described in this application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of the discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "means plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structures. Other replacements, modifications, changes, and omissions may be made in the design, operating conditions, and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0054] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A plate heat exchanger group with monitoring switching function, characterized in that: include, A heat exchanger component (100) comprises two heat exchanger bodies (101) arranged in parallel, each of the heat exchanger bodies (101) being provided with a plurality of water inlets (102), and a connecting pipe (103) being provided at the water inlets (102) of two adjacent heat exchanger bodies (101) for connecting the two corresponding water inlets (102); The switching component (200) is installed on the heat exchanger component (100), and comprises a three-way valve (201) installed on each connecting pipe (103). The three-way valves (201) are connected in series and synchronously controlled via a transmission component (202). A temperature sensing component (203) and a temperature measuring component (204) are respectively arranged on both sides of the three-way valve (201) on one of the connecting pipes (103). The temperature measuring component (204) is plugged into the temperature sensing component (203), and the temperature measuring component (204) is transmission-connected to the transmission component (202) via a gear rack set (205), so as to be inserted into the connecting pipe (103) in turn.

2. The plate heat exchanger group with monitoring and switching function according to claim 1 is characterized in that: The water outlets (102) of each heat exchanger body (101) respectively comprise a cold water outlet (102a), a cold water inlet (102b), a hot water inlet (102c) and a hot water outlet (102d), wherein the connecting pipe (103) connecting the two cold water outlets (102a) is a cold water outlet pipe (103a), the connecting pipe (103) connecting the two cold water inlets (102b) is a cold water inlet pipe (103b), the connecting pipe (103) connecting the two hot water inlets (102c) is a hot water inlet pipe (103c), and the connecting pipe (103) connecting the two hot water outlets (102d) is a hot water outlet pipe (103d).

3. The plate heat exchanger group with monitoring and switching function according to claim 2 is characterized in that: The connecting pipes (103) are, from high to low, a cold water outlet pipe (103a), a hot water inlet pipe (103c), a hot water outlet pipe (103d), and a cold water inlet pipe (103b), wherein a first three-way valve (201a) is provided on the cold water outlet pipe (103a), a second three-way valve (201b) is provided on the hot water inlet pipe (103c), a third three-way valve (201c) is provided on the hot water outlet pipe (103d), and a fourth three-way valve (201d) is provided on the cold water inlet pipe (103b).

4. The plate heat exchanger group with monitoring and switching function according to claim 3 is characterized in that: The valve core (201e) of each three-way valve (201) is fixedly connected to the rotating shaft (202a) of the transmission member (202), the outer end of the rotating shaft (202a) is fixedly connected to the first gear (202b), and the first gears (202b) are connected to each other via a toothed belt (202c).

5. The plate heat exchanger group with monitoring and switching function according to claim 4 is characterized in that: A mounting frame (202d) is provided on the connecting pipe (103), a second gear (202f) is mounted on the mounting frame (202d) via a bearing (202e), and the second gear (202f) is meshed with the toothed belt (202c).

6. The plate heat exchanger group with monitoring and switching function according to claim 5, characterized in that: Two insertion holes (103d-1) are symmetrically provided on the hot water outlet pipe (103d) with respect to the transmission member (202), and a sleeve (203a) of the temperature sensing member (203) is installed in each of the insertion holes (103d-1), and a power member (203b) is contained in the sleeve (203a).

7. The plate heat exchanger group with monitoring and switching function according to claim 6, characterized in that: The power component (203b) is a spring made of nickel-titanium alloy, which restores its original length at high temperature and pushes the temperature measuring component (204) to move outward.

8. The plate heat exchanger group with monitoring and switching function according to claim 6, characterized in that: The lower end of the temperature measuring element (204) is inserted into the sleeve (203a) and slides and rises and falls along the sleeve (203a), and a sealing state is formed between the temperature measuring element (204) and the sleeve (203a).

9. The plate heat exchanger group with monitoring and switching function according to claim 6, characterized in that: The gear rack assembly (205) comprises a connecting rod (205a) fixed to the two temperature measuring components (204), and a rack (205b) fixed to one end of the connecting rod (205a), and the left and right racks (205b) are respectively meshed on both sides of the second gear (202f).

10. The plate heat exchanger group with monitoring and switching function according to claim 7, characterized in that: The left and right racks (205b) have different lengths, and both racks (205b) are fixed to one end of the connecting rod (205a) through their upper ends.

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