Heat exchange unit and control method thereof

Abstract

The invention relates to the technical field of refrigeration equipment, and particularly discloses a heat exchange unit and a control method thereof. The heat exchange unit comprises a heat exchange core body, a water treatment device and a spraying loop, spraying liquid circulates in the spraying loop, the spraying loop is used for spraying the spraying liquid to the heat exchange core body, a liquid storage tank and a valve are arranged in the spraying loop, and the valve is used for switching the spraying loop between a first state and a second state; in the first state, the water treatment device is connected into the spraying loop, and spraying return liquid in the spraying loop enters the liquid storage tank to circulate after being treated by the water treatment device; in the second state, the inlet of the water treatment device is communicated with the liquid supplementing opening, and spraying return liquid in the spraying loop is bypassed to the liquid storage tank for circulation. According to the heat exchange unit and the control method thereof, the circulating spraying liquid can be treated in real time, the water quality of the spraying liquid is guaranteed, the maintenance frequency of the heat exchange core body structure is reduced, and the heat exchange efficiency of the heat exchange core body is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and more specifically, to a heat exchange unit and a control method thereof. Background Art

[0002] With the boom of the Internet, big data, and 5G, data centers are developing rapidly. Since data centers have the characteristics of high heat load density per unit area and high energy consumption, efficient heat dissipation in data centers has an important impact on their reliable operation. Heat exchangers are widely used in the field of data centers.

[0003] In the process of implementing this application, the inventors found that there are at least the following problems in the prior art:

[0004] Common heat exchangers usually use flushing and sewage treatment, which will lead to ion enrichment in the water tank, and the water tank is more likely to be dirty and blocked. In addition, heat exchangers generally use circulating water recovery operation, which can easily lead to scaling of the heat exchange core, resulting in a decrease in the heat exchange performance of the heat exchange core. Therefore, regular manual cleaning and maintenance are required, which increases labor costs. There are also centralized water treatment in the machine room of the heat exchanger, but it requires the configuration of large water tanks and softening water treatment resins, which is costly. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a heat exchanger unit and a control method thereof, which can effectively improve the problem that the heat exchanger unit is prone to scaling of the heat exchange core, resulting in a decrease in the heat exchange performance of the heat exchange core.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A heat exchange unit, comprising:

[0008] Heat exchange core;

[0009] Water treatment equipment;

[0010] A spray circuit, wherein a spray liquid circulates in the spray circuit and is used to spray the spray liquid onto the heat exchange core, wherein a liquid storage tank and a valve are provided in the spray circuit, and the valve is used to switch the spray circuit between a first state and a second state;

[0011] Among them, in the first state, the water treatment device is connected to the spray circuit, and the spray return liquid enters the liquid storage tank for circulation after being treated by the water treatment device, and the spray return liquid includes the spray liquid collected after being sprayed to the heat exchange core; in the second state, the inlet of the water treatment device is connected to the liquid replenishment port, and the spray return liquid in the spray circuit is bypassed to the liquid storage tank for circulation.

[0012] Optionally, in the above heat exchange unit, the water treatment device includes a water softener, a salt storage tank and a control valve, the water softener is connected to the spray circuit through the control valve, the salt storage tank is connected to the water softener through the control valve, and the control valve is used to control the water softener to be connected to the salt storage tank and disconnected from the liquid storage tank to perform regeneration treatment of the water softener, or control the salt storage tank to be disconnected from the water softener and connected to the liquid storage tank to perform softening treatment of the water softener;

[0013] The valve is used to switch the spray circuit to the first state when the water softener is performing a softening process; and to switch the spray circuit to the second state when the water softener is performing a regeneration process.

[0014] Optionally, in the above-mentioned heat exchanger unit, a liquid level detection device is provided in the liquid storage tank, and the valve is also used to switch the spray circuit to the second state when the liquid level in the liquid storage tank detected by the liquid level detection device is not greater than the first preset liquid level, and to switch the spray circuit to the first state when the liquid level in the liquid storage tank detected by the liquid level detection device reaches the second preset liquid level.

[0015] Optionally, in the above heat exchange unit, a filter is provided in the spray circuit for filtering the spray liquid.

[0016] Optionally, in the above heat exchange unit, a conductivity detection device is further provided in the spray circuit for detecting the conductivity of the spray liquid;

[0017] The liquid storage tank is connected to a drain valve, which is used to open to discharge the spray liquid when the conductivity detected by the conductivity detection device is greater than a preset conductivity, and close when the liquid level of the liquid storage tank drops to a first preset liquid level.

[0018] Optionally, in the above-mentioned heat exchange unit, the spray circuit includes a spray device and a spray liquid collecting device, and the spray liquid collecting device is arranged below the spray device and is used to collect the spray liquid; the outlet of the spray liquid collecting device is connected to the inlet of the water treatment device through a return liquid pipeline, and is connected to the inlet of the liquid storage tank through a bypass pipeline.

[0019] Optionally, in the above heat exchange unit, the valve comprises a first valve provided in the liquid return pipeline and a second valve provided in the bypass pipeline, and the first valve is connected to a liquid replenishing pipe;

[0020] The inlet of the first valve is optionally connected to the outlet of the spray liquid collecting device and one of the outlets of the liquid replenishing pipe, and the outlet of the first valve is connected to the inlet of the water treatment device; the inlet of the second valve is connected to the outlet of the spray liquid collecting device, and the outlet of the second valve is connected to the inlet of the liquid storage tank;

[0021] In the first state, the inlet of the first valve is connected to the outlet of the spray liquid collecting device, and the second valve is closed;

[0022] In the second state, the inlet of the first valve is connected to the outlet of the infusion tube, and the second valve is open.

[0023] Optionally, in the above heat exchange unit, the first valve is a three-way valve, and the three ports of the three-way valve are respectively connected to the outlet of the spray liquid collection device, the liquid replenishing pipe and the inlet of the water treatment device;

[0024] Alternatively, the first valve includes two two-way valves, one of which is connected between the outlet of the spray liquid collecting device and the inlet of the water treatment device, and the other is connected between the liquid replenishing pipe and the inlet of the water treatment device.

[0025] In order to achieve the above object, the present invention further provides a control method for a heat exchanger unit, which is used for any of the above heat exchangers, comprising:

[0026] During the operation of the spray circuit, when the water treatment device needs to be regenerated, the spray circuit is switched to the second state so that the spray return liquid of the spray circuit bypasses the liquid storage tank for circulation until the regeneration of the water treatment device is completed, and then the spray circuit is switched to the first state.

[0027] Optionally, the control method of the heat exchanger unit further includes:

[0028] When the conductivity of the spray liquid is greater than the preset conductivity, the liquid storage tank is controlled to drain the liquid until the liquid level of the liquid storage tank drops to a first preset liquid level, and then the drainage is stopped.

[0029] Optionally, the control method of the heat exchanger unit further includes:

[0030] When the liquid level in the liquid storage tank drops to a first preset liquid level, the valve switches the spray circuit to the second state, and the spray return liquid of the spray circuit bypasses the liquid storage tank for circulation until the liquid level in the liquid storage tank rises to a second preset liquid level, and the valve switches the spray circuit to the first state.

[0031] The heat exchange unit and control method provided by the present invention are applied. By setting a water treatment device, that is, integrating the water treatment device into the heat exchange unit, when the spray circuit is running, the valve switches the spray circuit to the first state, and the spray return liquid of the spray circuit enters the liquid storage tank for circulation after being treated by the water treatment device. The circulating spray liquid can be treated in real time to ensure the water quality of the spray liquid, thereby reducing the maintenance times of the heat exchange core structure, ensuring the heat exchange efficiency of the heat exchange core, enabling it to continuously output high-efficiency heat exchange, and reducing the water resources lost by the heat exchange unit due to sewage discharge. The water treatment device is combined with the liquid storage tank to save the unit space. And when the water treatment device needs to be regenerated, or the liquid volume of the liquid storage tank is insufficient, the valve switches the spray circuit to the second state, and the spray return liquid of the spray circuit bypasses the liquid storage tank for circulation. While providing continuous spraying, the water treatment device can be regenerated or the liquid storage tank can be replenished. Therefore, while the heat exchange unit can operate reliably, the treatment efficiency and quality of the water treatment device are guaranteed, thereby being able to always ensure the water quality of the circulating spray liquid during operation.

[0032] In addition, the water treatment device is integrated into the heat exchanger unit, which utilizes the space of the heat exchanger unit. There is no need to separately configure a centralized water treatment device and supporting facilities in the machine room. The heat exchanger unit can independently process the circulating spray liquid, which reduces the investment cost of the machine room. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0034] Figure 1 The figure is a schematic diagram of the principle of a heat exchange unit according to a specific embodiment of the present invention.

[0035] Reference numerals:

[0036] 1-heat exchange core; 2-spray circuit; 3-water treatment device; 4-evaporator; 5-outdoor fan; 6-indoor fan; 7-condenser;

[0037] 22-liquid storage tank; 23-valve; 24-liquid level detection device; 25-filter; 26-conductivity detection device; 27-spraying device; 28-spraying liquid collection device; 29-liquid pump;

[0038] 31-water softener; 32-salt storage; 33-control valve; 34-drain valve;

[0039] 221-drain valve;

[0040] 231-first valve; 232-second valve;

[0041] 241-first liquid level switch; 242-second liquid level switch; 243-third liquid level switch; 244-fourth liquid level switch;

[0042] 201- bypass pipeline; 202- liquid return pipeline; 203- liquid replenishment pipe; 204- spray liquid pipe; 205- salt supply pipe; 206- water treatment device liquid supply pipe; 207- water treatment device discharge pipe. DETAILED DESCRIPTION

[0043] The embodiment of the present invention discloses a heat exchange unit and a control method thereof, so as to process circulating spray liquid in real time, ensure the water quality of the spray liquid, reduce the maintenance times of the heat exchange core structure, and ensure the heat exchange efficiency of the heat exchange core.

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] The heat exchanger provided in this application is applicable to, but not limited to, cooling of a data center. For ease of explanation, the heat exchanger is used for cooling of a data center computer room as an example. Figure 1 The heat exchange unit includes a heat exchange core 1 and a spray loop 2. The high-temperature indoor return air of the computer room exchanges heat with the air from the outside through the heat exchange core 1, and then exchanges heat again through the evaporator 4 (when the compressor is running). After cooling, it is sent to the computer room driven by the indoor fan 6 to cool the server. The outdoor incoming air is cooled by the spray liquid of the spray loop 2 (when the spray loop 2 is running), exchanges heat with the indoor return air through the heat exchange core 1, and then exchanges heat with the condenser 7 (when the compressor is running), and finally discharged to the outdoor environment driven by the outdoor fan 5.

[0046] The heat exchanger unit has three operating modes. When the outdoor temperature is low in winter, the unit operates in dry mode. At this time, the spray circuit 2 and the compressor are not running, and the cooling demand can be met by relying on the heat exchange of the heat exchange core; in the transition season, the unit operates in wet mode. At this time, the spray circuit 2 is running and the compressor is not running. The heat exchange of the heat exchange core is increased by spraying to meet the cooling demand; in the hot season, the unit operates in mixed mode. At this time, the spray circuit 2 and the compressor are both running, and the cooling demand is met by the heat exchange core and the compressor.

[0047] In the present application, a water treatment device 3 is integrated in the heat exchange unit to achieve the treatment of the circulating spray liquid in the heat exchange unit. In the following embodiments, the structure and control related to the treatment of the circulating spray liquid are mainly described.

[0048] In some embodiments, the heat exchange unit includes a heat exchange core 1, a water treatment device 3 and a spray circuit 2. The spray circuit 2 is used to spray spray liquid onto the heat exchange core 1 to cool the outdoor air flowing through the heat exchange core 1, and the spray liquid can circulate in the spray circuit 2. For example, a spray device 27, a spray liquid collection device 28 and a liquid pump 29 are provided in the spray circuit 2. The liquid pump 29 is used to pump the spray return liquid collected by the spray liquid collection device 28 to the spray device 27 to realize the circulation of the spray liquid. In this embodiment, a liquid storage tank 22 and a valve 23 are also provided in the spray circuit 2. The valve 23 is used to switch the spray circuit 2 between the first state and the second state. Among them, the water treatment device 3 is used to process the spray return liquid. It can be understood that the spray return liquid in this application refers to the spray liquid collected after being sprayed onto the heat exchange core 1. For example, the water treatment device 3 is used to soften the spray return liquid. The liquid storage tank 22 is used to store the spray liquid. Specifically, the spray return liquid flows into the liquid storage tank 22, and the spray liquid in the liquid storage tank 22 can be sent to the heat exchange core 1 for spraying to realize the circulation of the spray liquid. The valve 23 is connected to the liquid storage tank 22 and the water treatment device 3. The spray circuit 2 can be switched between the first state and the second state through the action of the valve 23, that is, the valve 23 can switch the flow path of the spray return liquid. Specifically, in the first state, the water treatment device 3 is connected to the spray circuit 2, and the spray return liquid in the spray circuit 2 does not directly enter the liquid storage tank 22, but enters the liquid storage tank 22 for circulation after being processed by the water treatment device 3, that is, the return liquid collected after spraying to the heat exchange core 1 enters the liquid storage tank 22 after being processed by the water treatment device 3, and is transported to the heat exchange core 1 for spraying again by the liquid storage tank 22 to realize circulation. In the second state, the inlet of the water treatment device 3 is connected to the liquid replenishing port, and the spray return liquid in the spray circuit 2 is bypassed to the liquid storage tank 22 for circulation, that is, the return liquid collected after spraying to the heat exchange core 1 is not processed by the water treatment device 3, but directly enters the liquid storage tank 22, and is transported from the liquid storage tank 22 to the heat exchange core 1 for spraying again to realize circulation.

[0049] The heat exchange unit provided by the present invention is applied, by setting a water treatment device 3, that is, the water treatment device 3 is integrated into the heat exchange unit. When the spray circuit 2 is running, the valve 23 switches the spray circuit 2 to the first state, and the spray return liquid of the spray circuit 2 enters the liquid storage tank 22 for circulation after being processed by the water treatment device 3. The circulating spray liquid can be processed in real time to ensure the water quality of the spray liquid, thereby reducing the maintenance times of the heat exchange core 1 structure, ensuring the heat exchange efficiency of the heat exchange core 1, and reducing the water resources lost by the heat exchange unit due to sewage discharge. When the water treatment device 3 needs to be regenerated, or the liquid volume of the liquid storage tank 22 is insufficient, the valve 23 switches the spray circuit 2 to the second state, and the spray return liquid of the spray circuit 2 bypasses the liquid storage tank 22 for circulation. While providing continuous spraying, the water treatment device 3 can be regenerated or the liquid storage tank 22 can be replenished. Therefore, while the heat exchange unit can operate reliably, the processing efficiency and quality of the water treatment device 3 are guaranteed, and the water quality of the circulating spray liquid can be always guaranteed during operation.

[0050] In addition, the water treatment device 3 is integrated into the heat exchange unit, which utilizes the space of the heat exchange unit. There is no need to separately configure a centralized water treatment device 3 and supporting facilities in the machine room, thereby reducing operating costs.

[0051] In some embodiments, the water treatment device 3 includes a water softener 31, a salt storage tank 32 and a control valve 33. The water softener 31 is connected to the spray circuit 2 through the control valve 33, and the salt storage tank 32 is connected to the water softener 31 through the control valve 33. The control valve 33 is used to control the water softener 31 to communicate with the salt storage tank 32 and disconnect from the liquid storage tank 22 to regenerate the water softener 31, or to control the salt storage tank 32 to disconnect from the water softener 31 and communicate with the liquid storage tank 22 to soften the water softener 31. Exemplarily, the water softener 31 adopts a resin separation softening technology, through the sodium ion exchange softening method of water, that is, when the spray return liquid passes through the sodium ion exchanger, the Ca in the spray return liquid 2+ 、mg 2+ The Na in the sodium ion exchanger +The water treatment device 3 specifically includes a controller, which is connected to the multi-way control valve, and the water treatment device 3 is controlled by the multi-way control valve. By controlling the action of the multi-way control valve, the backwash treatment, regeneration treatment, replacement treatment, and forward washing treatment of the water treatment device 3 are realized. Exemplarily, the water treatment device 3 uses a fully automatic sodium ion exchanger. Exemplarily, the water treatment device 3 uses a fully automatic sodium ion exchanger. Exemplarily, the water softener 31 is connected to a drain valve 34, such as the water softener 31 is connected to a water treatment device drain pipe 207, and the water treatment device drain pipe 207 is provided with a drain valve 34. During the regeneration treatment, the drain valve 34 is opened to discharge the liquid after the regeneration treatment. During the softening treatment of the water softener 31, the drain valve 34 is closed.

[0052] The water treatment device 3 is configured as above, and the valve 23 is used to switch the spray circuit 2 to the first state when the water softener 31 is softening; and to switch the spray circuit 2 to the second state when the water softener 31 is regenerating. Exemplarily, when the spray circuit 2 is in operation, that is, when the unit needs to spray the heat exchange core 1, the spray circuit 2 is in operation. If the water softener 31 has no regeneration requirement, the valve 23 switches the spray circuit 2 to the first state, the water softener 31 softens the spray return liquid, and the treated spray return liquid enters the liquid storage tank 22 and then sprays the heat exchange core 1. When the water softener 31 has a regeneration requirement, the valve 23 switches the spray circuit 2 to the second state, and the liquid at the liquid replenishment port, such as tap water, enters the water softener 31 to regenerate the water softener 31. At this time, the spray return liquid directly flows back to the liquid storage tank 22 and is directly used for circulating the spray liquid. When the regeneration is completed, the valve 23 switches the spray circuit 2 to the first state again. The above arrangement ensures the effectiveness and reliability of the water softener 31 in treating the spray liquid, avoids the deterioration of the spray return liquid water quality caused by insufficient reaction between the exchange agent and the spray return liquid, and thus enables the circulating spray liquid to always maintain a relatively good water quality.

[0053] In some embodiments, the water treatment device 3 also includes a sand filter and a carbon filter connected to the inlet of the water softener 31 to filter the liquid from the spray return liquid or the liquid replenishment pipe 203. The treated liquid then enters the water softener 31 for softening, further improving the water quality.

[0054] In some embodiments, a liquid level detection device 24 is provided in the liquid storage tank 22, and the valve 23 is used to switch the spray circuit 2 to the first state or the second state when the liquid level in the liquid storage tank 22 is detected by the liquid level detection device 24. In this embodiment, the liquid level in the liquid storage tank 22 is detected by the liquid level detection device 24, and the state of the spray circuit 2 is controlled accordingly, so that the heat exchange core 1 can be sprayed uninterruptedly when the spray circuit 2 is running, and insufficient cooling of the outdoor air intake caused by insufficient spray liquid is avoided.

[0055] Specifically, the valve 23 is used to switch the spray circuit 2 to the second state when the liquid level in the liquid storage tank 22 detected by the liquid level detection device 24 is not greater than the first preset liquid level, and to switch the spray circuit 2 to the first state when the liquid level in the liquid storage tank 22 detected by the liquid level detection device 24 reaches the second preset liquid level. When the liquid level in the liquid storage tank 22 is not greater than the first preset liquid level, it indicates that the spray liquid in the liquid storage tank 22 is insufficient and needs to be replenished. The valve 23 switches the spray circuit 2 to the second state, and the liquid at the replenishment port, such as tap water, enters the softener 31 for softening treatment and then supplies liquid to the liquid storage tank 22. At this time, the spray return liquid directly flows back to the liquid storage tank 22 and is directly used for circulating the spray liquid. When the liquid level in the liquid storage tank 22 detected by the liquid level detection device 24 reaches the second preset liquid level, it indicates that the spray liquid in the liquid storage tank 22 is sufficient, the valve 23 switches the spray circuit 2 to the first state, the water treatment device 3 softens the spray return liquid, and the treated spray return liquid enters the liquid storage tank 22 and then sprays to the heat exchange core 1. Exemplarily, the height of the second preset liquid level is above the first preset liquid level.

[0056] In some embodiments, the spray circuit 2 is used to start when the liquid level in the liquid storage tank 22 detected by the liquid level detection device 24 reaches the second preset liquid level. That is, when the spray circuit 2 needs to be operated, it first detects whether the liquid level in the liquid storage tank 22 reaches the second preset liquid level. When it reaches the second preset liquid level, the spray circuit 2 operates to spray the heat exchange core 1; when the liquid level in the liquid storage tank 22 does not reach the second preset liquid level, the inlet of the water treatment device 3 is connected to the liquid replenishing port to replenish liquid.

[0057] In some embodiments, the liquid level detection device 24 uses a liquid level switch. Exemplarily, a first liquid level switch 241 is set corresponding to the first preset liquid level, and a second liquid level switch 242 is set corresponding to the second preset liquid level. When the first liquid level switch 241 and the second liquid level switch 242 in the liquid storage tank 22 are both disconnected, indicating that the liquid amount in the liquid storage tank 22 is insufficient, the valve 23 switches the spray circuit 2 to the second state to replenish the spray liquid. When the first liquid level switch 241 and the second liquid level switch 242 in the liquid storage tank 22 are both closed, indicating that the liquid amount in the liquid storage tank 22 is sufficient, the valve 23 switches the spray circuit 2 to the first state.

[0058] In some embodiments, a third liquid level switch 243 is further provided at the third preset liquid level in the liquid storage tank 22, and the height of the third preset liquid level is lower than the first preset liquid level. When the first liquid level switch 241, the second liquid level switch 242 and the third liquid level switch 243 in the liquid storage tank 22 are all closed, indicating that the liquid in the liquid storage tank 22 is sufficient, the valve 23 switches the spray circuit 2 to the first state.

[0059] In some embodiments, a fourth liquid level switch 244 is further provided at a fourth preset liquid level in the liquid storage tank 22, and the height of the fourth preset liquid level is greater than the second preset liquid level. When the first liquid level switch 241, the second liquid level switch 242 and the fourth liquid level switch 244 in the liquid storage tank 22 are all disconnected, indicating that the liquid volume in the liquid storage tank 22 is insufficient, the valve 23 switches the spray circuit 2 to the second state to replenish the spray liquid.

[0060] In some embodiments, a filter 25 is provided in the spray circuit 2 for filtering the spray liquid. By providing the filter 25 to filter the spray liquid, the water quality of the spray liquid is further improved to better prevent the heat exchange core 1 from scaling.

[0061] In some embodiments, a conductivity detection device 26 is further provided in the spray loop 2 for detecting the conductivity of the spray liquid. The conductivity detection device 26 detects the conductivity of the spray liquid, which can reflect the water quality of the spray liquid, and thus facilitates relevant personnel or equipment to perform corresponding processing when the conductivity of the spray liquid does not meet the requirements, so as to prevent unqualified spray liquid from being sprayed onto the heat exchange core 1, causing scaling of the heat exchange core 1, or reducing the heat exchange efficiency of the heat exchange core 1.

[0062] In some embodiments, the liquid storage tank 22 is connected to a drain valve 221. Through the setting of the drain valve 221, the spray liquid in the liquid storage tank 22 can be discharged. If the spray liquid does not meet the spraying requirements, the spray liquid can be discharged.

[0063] Exemplarily, the drain valve 221 is used to open when the conductivity detected by the conductivity detection device 26 is greater than the preset conductivity to discharge the spray liquid, and is used to close when the liquid level of the liquid storage tank 22 drops to the first preset liquid level. The conductivity of the spray liquid is detected by the conductivity detection device 26 to reflect the water quality of the spray liquid. When it is greater than the preset conductivity, it indicates that the continued circulation of the spray liquid will no longer meet the spraying requirements, so the drain valve 221 is opened to discharge the spray liquid in the liquid storage tank 22. And when the liquid level of the liquid storage tank 22 drops to the first preset liquid level, the drain valve 221 is closed to stop the discharge. Specifically, the first preset liquid level is greater than zero, that is, the liquid level in the liquid storage tank 22 drops to the first preset liquid level greater than zero, and the discharge is stopped. Most of the liquid in the liquid storage tank 22 can be discharged, and at the same time, a certain amount of spray liquid reserved in the liquid storage tank 22 can ensure the circulation of the spray liquid, that is, continuous spraying to the heat exchange core 1.

[0064] Specifically, after the liquid level of the liquid storage tank 22 drops to the first preset liquid level, the drain valve 221 is closed, and the valve 23 switches the spray circuit 2 to the second state. The liquid in the liquid replenishing pipe 203, such as tap water, enters the softener 31 for softening and then supplies liquid to the liquid storage tank 22. At this time, the spray return liquid directly flows back to the liquid storage tank 22 and is directly used for circulating the spray liquid. When the liquid level in the liquid storage tank 22 detected by the liquid level detection device 24 reaches the second preset liquid level, it indicates that the spray liquid in the liquid storage tank 22 is sufficient, and the valve 23 switches the spray circuit 2 to the first state. The detection of the liquid level in the liquid storage tank 22 can be detected by the liquid level detection device 24 in the above embodiment.

[0065] In some embodiments, the spray circuit 2 includes a spray device 27 and a spray liquid collecting device 28. The spray liquid collecting device 28 is disposed below the spray device 27 and is used to collect the spray liquid. The outlet of the spray liquid collecting device 28 is respectively connected to the inlet of the water treatment device 3 through the return liquid pipeline 202, and the outlet of the spray liquid collecting device 28 is connected to the inlet of the liquid storage tank 22 through the bypass pipeline 201. Through the cooperation between the spray device 27 and the spray liquid collecting device 28, the spray device 27 can spray the spray liquid evenly to the heat exchange core 1, and the spray liquid collecting device 28 can collect the sprayed spray return liquid, and can enter the liquid storage tank 22 through the bypass pipeline 201, or enter the liquid storage tank 22 through the return liquid pipeline 202, for recycling. It can be understood that the return liquid pipeline 202 and the bypass pipeline 201 can be connected to the same inlet of the liquid storage tank 22, or can be connected to different inlets of the liquid storage tank 22. Exemplarily, the liquid storage tank 22 is connected to the spray liquid collecting device 28 via the spray liquid pipe 204204, and the spray liquid collecting device 28 is specifically a liquid receiving tray.

[0066] Furthermore, the valve 23 includes a first valve 231 arranged in the return liquid pipeline 202 and a second valve 232 arranged in the bypass pipeline 201, and the first valve 231 is connected to the liquid replenishment pipe 203; the inlet of the first valve 231 is optionally connected to the outlet of the spray liquid collecting device 28 and one of the inlets of the liquid replenishment pipe 203, the outlet of the first valve 231 is connected to the inlet of the water treatment device 3, the inlet of the second valve 232 is connected to the outlet of the spray liquid collecting device 28, and the outlet of the second valve 232 is connected to the inlet of the liquid storage tank 22; in the first state, the inlet of the first valve 231 is connected to the outlet of the spray liquid collecting device 28, and the second valve 232 is closed; in the second state, the inlet of the first valve 231 is connected to the outlet of the liquid replenishment pipe 203, and the second valve 232 is opened. That is, the first valve 231 is used to switch the inlet of the water treatment device 3 to be connected to the outlet of the spray liquid collection device 28, or to be connected to the liquid replenishing pipe 203; the second valve 232 is used to disconnect the outlet of the spray liquid collection device 28 and the inlet of the liquid storage tank 22 or connect the two. The first valve 231 and the second valve 232 cooperate to realize the switching between the first state and the second state, which has a simple structure and is easy to control.

[0067] Exemplarily, the second valve 232 is a two-way valve, whose two ports are respectively connected to the outlet of the spray liquid collecting device 28 and the inlet of the liquid storage tank 22. When the second valve 232 is disconnected, the outlet of the spray liquid collecting device 28 and the inlet of the liquid storage tank 22 are disconnected; when the second valve 232 is opened, the outlet of the spray liquid collecting device 28 and the inlet of the liquid storage tank 22 are connected, that is, the outlet of the spray liquid collecting device 28 is connected to the inlet of the liquid storage tank 22 through the bypass line 201.

[0068] In some embodiments, the first valve 231 is a three-way valve, and the three ports of the three-way valve are respectively connected to the outlet of the spray liquid collection device 28, the liquid replenishing pipe 203 and the inlet of the water treatment device 3. The first valve 231 can be switched between the first position and the second position. When it is placed in the first position, the inlet of the water treatment device 3 is connected to the outlet of the spray liquid collection device 28, and when it is placed in the second position, the inlet of the water treatment device 3 is connected to the liquid replenishing pipe 203. The three-way valve has a simple structure and is easy to connect and control.

[0069] In other embodiments, the first valve 231 includes two two-way valves, one of which is connected between the outlet of the spray liquid collecting device 28 and the inlet of the water treatment device 3, and the other is connected between the liquid replenishing pipe 203 and the inlet of the water treatment device 3. By cooperating with the two two-way valves, the inlet of the water treatment device 3 can also be switched between being connected to the outlet of the spray liquid collecting device 28 or being connected to the liquid replenishing pipe 203.

[0070] In some further embodiments, the inlet of the water treatment device 3 can also be connected to the outlet of the spray liquid collection device 28 and connected to the liquid replenishment pipe 203 through the return liquid pipeline 202, and the first valve 231 can also include a two-way valve respectively arranged on the return liquid pipeline 202 and the liquid replenishment pipe 203.

[0071] Exemplarily, the first valve 231, the second valve 232 and other valves 23 mentioned in the present application can all be electromagnetic valves, so as to realize automatic control through a control device. In other embodiments, each valve can also be a manual control valve for manual control.

[0072] In some embodiments, a liquid pump 29 is connected between the liquid storage tank 22 and the spray device 27 to pump the spray liquid in the liquid storage tank 22 to the spray device 27. In the case where a conductivity detection device 26 is provided in the spray circuit 2, the conductivity detection device 26 can be connected between the liquid pump 29 and the spray device 27. In the case where a filter 25 is provided in the spray circuit 2, the filter 25 can be connected between the liquid pump 29 and the conductivity detection device 26. In addition, a one-way valve can also be provided between the liquid pump 29 and the spray device 27 to ensure a one-way circulation flow of the spray liquid.

[0073] Based on the heat exchanger unit provided in the above embodiment, the present invention also provides a control method for the heat exchanger unit.

[0074] In some embodiments, the control method of the heat exchange unit includes:

[0075] During the operation of the spray circuit 2, when the water treatment device 3 needs to be regenerated, the spray circuit 2 is switched to the second state so that the spray return liquid of the spray circuit 2 is bypassed to the liquid storage tank 22 for circulation until the regeneration of the water treatment device 3 is completed, and then the spray circuit 2 is switched to the first state.

[0076] When the heat exchange unit needs to spray the heat exchange core 1, specifically when the liquid pump 29 needs to be turned on, the liquid pump 29 turns on the spray circuit 2, and the valve 23 switches the spray circuit 2 to the first state. The spray return liquid enters the liquid storage tank 22 after being processed by the water treatment device 3, and then flows back into the spray device 27 through the action of the liquid pump 29 to spray the heat exchange core 1. During operation, when the water treatment device 3 needs to be regenerated, the valve 23 switches the spray circuit 2 to the second state to regenerate the water treatment device 3. After the regeneration is completed, the valve 23 switches the spray circuit 2 to the first state, continues to process the spray return liquid, and then transports it to the liquid storage tank 22.

[0077] By applying the control method of the heat exchange unit provided by the present invention, the circulating spray liquid is processed in real time to ensure the water quality of the spray liquid, thereby reducing the maintenance times of the heat exchange core 1 structure, ensuring the heat exchange efficiency of the heat exchange core 1, and reducing the water resources lost by the heat exchange unit due to sewage discharge. When the water treatment device 3 needs to be regenerated, the valve 23 switches the spray circuit 2 to the second state, and the spray return liquid of the spray circuit 2 bypasses the liquid storage tank 22 for circulation, providing continuous spraying while the water treatment device 3 can be regenerated. Therefore, while the heat exchange unit can operate reliably, the processing efficiency and quality of the water treatment device 3 are guaranteed, and the water quality of the circulating spray liquid can be always guaranteed during operation.

[0078] In addition, the water treatment device 3 is integrated into the heat exchange unit, which utilizes the space of the heat exchange unit. There is no need to separately configure a centralized water treatment device 3 and supporting facilities in the machine room, thereby reducing operating costs.

[0079] In some embodiments, the control method further includes: before the spray circuit 2 is operated, the valve 23 connects the inlet of the water treatment device 3 with the liquid replenishing port until the liquid level in the liquid storage tank 22 reaches the second preset liquid level, and the valve 23 switches the spray circuit 2 to the first state. That is, before the spray circuit 2 is operated, the liquid storage tank 22 is replenished in advance, and when the liquid level in the liquid storage tank 22 reaches the second preset liquid level, the spray circuit 2 is switched to the first state through the valve 23. Exemplarily, when the liquid pump 29 of the heat exchange unit has a need to be turned on, the valve 23 controls the liquid replenishing pipe 203 to be connected to the inlet of the water treatment device 3, and the outlet of the spray liquid collection device 28 is disconnected from the liquid storage tank 22, and tap water is directly used to enter the water treatment device 3 for softening treatment, and then enters the liquid storage tank 22. When the liquid level in the liquid storage tank 22 reaches the second preset liquid level, it indicates that the liquid level meets the conditions for turning on the liquid pump 29, and the liquid pump 29 is started.

[0080] In some embodiments, the control method of the heat exchange unit further includes:

[0081] When the liquid level of the liquid storage tank 22 drops to the first preset liquid level, the spray circuit 2 is switched to the second state so that the spray return liquid of the spray circuit 2 bypasses the liquid storage tank 22 for circulation until the liquid level of the liquid storage tank 22 rises to the second preset liquid level, and the spray circuit 2 is switched to the first state.

[0082] During the operation of the heat exchange unit, when the liquid volume in the liquid storage tank 22 is insufficient, that is, the liquid level drops to the first preset liquid level, the valve 23 switches the spray circuit 2 to the second state, and the liquid storage tank 22 is replenished. When the liquid volume in the liquid storage tank 22 is sufficient, that is, the liquid level rises to the second preset liquid level, the valve 23 switches the spray circuit 2 to the first state. Exemplarily, the liquid level in the liquid storage tank 22 can be detected by the liquid level detection device 24 in the above embodiment.

[0083] In some embodiments, the control method of the heat exchange unit further includes:

[0084] When the conductivity of the spray liquid is greater than the preset conductivity, the liquid storage tank 22 is controlled to drain the liquid until the liquid level of the liquid storage tank 22 drops to the first preset liquid level, and then the drainage is stopped.

[0085] After the liquid level of the liquid storage tank 22 drops to the first preset liquid level, the valve 23 switches the spray circuit 2 to the second state, and the spray return liquid of the spray circuit 2 bypasses the liquid storage tank 22 for circulation until the liquid level of the liquid storage tank 22 rises to the second preset liquid level, and the valve 23 switches the spray circuit 2 to the first state. When the conductivity of the spray liquid is greater than the preset conductivity, the spray liquid in the liquid storage tank is discharged and the liquid is replenished again, further improving the water quality of the spray liquid. For example, the conductivity of the spray liquid can be detected by the conductivity detection device 26 in the above embodiment.

[0086] The following is a description based on a preferred embodiment.

[0087] In this embodiment, a spray device 27, a spray liquid collecting device 28, a water treatment device 3, a liquid storage tank 22, a liquid pump 29 and a conductivity detection device 26 are provided in the spray circuit 2. A liquid level detection device 24 is provided in the liquid storage tank 22. The valve 23 includes a first valve 231 provided in the return liquid pipeline 202 and a second valve 232 provided in the bypass pipeline 201. The first valve 231 is connected to the liquid replenishment pipe 203.

[0088] When the liquid pump 29 needs to be turned on, the first valve 231 controls the liquid replenishment pipe 203 to be connected with the inlet of the water treatment device 3, and the second valve 232 is closed. Tap water is directly used to enter the water treatment device 3 for softening water treatment, and then enters the liquid storage tank 22 through the water treatment device liquid supply pipe 206. When the first liquid level switch 241 and the second liquid level switch 242 in the liquid storage tank 22 are both closed, it means that the liquid level meets the start condition of the liquid pump 29, and the liquid pump 29 is started.

[0089] When the liquid pump 29 of the unit is running, if the water treatment device 3 has no regeneration treatment requirement, the first valve 231 is switched to connect the outlet of the spray liquid collection device 28 with the inlet of the water treatment device 3 through the return liquid pipeline 202, and the second valve 232 is closed, and the spray return liquid first enters the water treatment device 3 for water treatment, and then is transported to the liquid storage tank 22 and provided to the spray device 27 through the liquid pump 29.

[0090] If the water treatment device 3 needs to be regenerated, the first valve 231 is switched to the liquid replenishment pipe 203 to be connected to the inlet of the water treatment device 3, and tap water is directly used to regenerate the water treatment device 3. At this time, the second valve 232 is opened, and the spray return liquid is directly returned to the liquid storage tank 22 for direct recycling. After the regeneration of the water treatment device 3 is completed, the first valve 231 is switched to the outlet of the spray liquid collection device 28 to be connected to the inlet of the water treatment device 3 through the return liquid pipeline 202, and the second valve 232 is closed. After the spray return liquid is treated, it is transported to the liquid storage tank 22, and the liquid pump 29 provides it to the spray device 27.

[0091] If the first liquid level switch 241 and the second liquid level switch 242 in the liquid storage tank 22 are both disconnected, indicating that the liquid volume of the liquid storage tank 22 is insufficient, the first valve 231 is switched to the liquid replenishing pipe 203 to communicate with the inlet of the water treatment device 3, the second valve 232 is opened, and tap water or the like is directly used to enter the water treatment device 3 for softening water treatment, and then enters the liquid storage tank 22 through the water treatment device liquid supply pipe 206. When the first liquid level switch 241 and the second liquid level switch 242 are both closed, indicating that the liquid volume is sufficient, the first valve 231 is switched to the outlet of the spray liquid collection device 28 to communicate with the inlet of the water treatment device 3 through the return liquid pipeline 202, the second valve 232 is closed, the spray return liquid is treated with water, and then transported to the liquid storage tank 22, and the liquid pump 29 provides it to the spray device 27.

[0092] If the conductivity detected by the conductivity detection device 26 is greater than the preset conductivity, the drain valve 221 is opened until the first liquid level switch 241 is disconnected, and the drain valve 221 is closed. At this time, the first valve 231 is switched to the liquid replenishment pipe 203 to communicate with the inlet of the water treatment device 3, and the second valve 232 is opened. Tap water is directly used to enter the water treatment device 3 for softening water treatment, and then enters the liquid storage tank 22 through the water treatment device liquid supply pipe 206 until the second liquid level switch 242 is closed. The first valve 231 is switched to the outlet of the spray liquid collection device 28 to communicate with the inlet of the water treatment device 3 through the return liquid pipeline 202, and the second valve 232 is closed. After the spray return liquid is treated, it is transported to the liquid storage tank 22, and the liquid pump 29 provides it to the spray device 27.

[0093] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0094] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heat exchange unit, characterized in that: include: Heat exchange core (1); Water treatment equipment (3); A spray circuit (2), wherein a spray liquid circulates in the spray circuit (2), and the spray circuit (2) is used to spray the spray liquid onto the heat exchange core (1), and the spray circuit (2) is provided with a liquid storage tank (22) and a valve (23), and the valve (23) is used to switch the spray circuit (2) between a first state and a second state; Wherein, in the first state, the water treatment device (3) is connected to the spray circuit (2), and the spray return liquid enters the liquid storage tank (22) for circulation after being processed by the water treatment device (3), and the spray return liquid includes the spray liquid collected after being sprayed to the heat exchange core (1); in the second state, the inlet of the water treatment device (3) is connected to the liquid replenishing port, and the spray return liquid in the spray circuit (2) is bypassed to the liquid storage tank (22) for circulation.

2. The heat exchange unit according to claim 1, characterized in that: The water treatment device (3) comprises a water softener (31), a salt storage device (32) and a control valve (33); the water softener (31) is connected to the spray circuit (2) via the control valve (33); the salt storage device (32) is connected to the water softener (31) via the control valve (33); the control valve (33) is used to control the water softener (31) to be connected to the salt storage device (32) and disconnected from the liquid storage tank (22) to perform a regeneration treatment of the water softener (31); or to control the salt storage device (32) to be disconnected from the water softener (31) and connected to the liquid storage tank (22) to perform a softening treatment of the water softener (31); The valve (23) is used to switch the spray circuit (2) to the first state when the water softener (31) is performing a softening process; and to switch the spray circuit (2) to the second state when the water softener (31) is performing a regeneration process.

3. The heat exchange unit according to claim 1, characterized in that: A liquid level detection device (24) is provided in the liquid storage tank (22), and the valve (23) is further used to switch the spray circuit (2) to the second state when the liquid level in the liquid storage tank (22) detected by the liquid level detection device (24) is not greater than a first preset liquid level, and to switch the spray circuit (2) to the first state when the liquid level in the liquid storage tank (22) detected by the liquid level detection device (24) reaches a second preset liquid level.

4. The heat exchange unit according to claim 1, characterized in that: A filter (25) is provided in the spray circuit (2) for filtering the spray liquid.

5. The heat exchange unit according to any one of claims 1 to 4, characterized in that: The spray circuit (2) is also provided with a conductivity detection device (26) for detecting the conductivity of the spray liquid; The liquid storage tank (22) is connected to a drain valve (221), the drain valve (221) being used to open to discharge the spray liquid when the conductivity detected by the conductivity detection device (26) is greater than a preset conductivity, and to close when the liquid level in the liquid storage tank (22) drops to a first preset liquid level.

6. The heat exchange unit according to any one of claims 1 to 4, characterized in that: The spray circuit (2) comprises a spray device (27) and a spray liquid collecting device (28); the spray liquid collecting device (28) is arranged below the spray device (27) and is used to collect the spray liquid; the outlet of the spray liquid collecting device (28) is connected to the inlet of the water treatment device (3) via a liquid return pipeline (202), and is connected to the inlet of the liquid storage tank (22) via a bypass pipeline (201).

7. The heat exchange unit according to claim 6, characterized in that: The valve (23) comprises a first valve (231) provided in the liquid return pipeline (202) and a second valve (232) provided in the bypass pipeline (201), wherein the first valve (231) is connected to a liquid replenishing pipe (203); The inlet of the first valve (231) is optionally connected to the outlet of the spray liquid collecting device (28) and one of the outlets of the liquid replenishing pipe (203), and the outlet of the first valve (231) is connected to the inlet of the water treatment device (3); the inlet of the second valve (232) is connected to the outlet of the spray liquid collecting device (28), and the outlet of the second valve (232) is connected to the inlet of the liquid storage tank (22); In the first state, the inlet of the first valve (231) is connected to the outlet of the spray liquid collecting device (28), and the second valve (232) is closed; In the second state, the inlet of the first valve (231) is connected to the outlet of the liquid infusion tube (203), and the second valve (232) is open.

8. The heat exchange unit according to claim 7, characterized in that: The first valve (231) is a three-way valve, and the three ports of the three-way valve are respectively connected to the outlet of the spray liquid collection device (28), the liquid replenishing pipe (203) and the inlet of the water treatment device (3); Alternatively, the first valve (231) comprises two two-way valves, one of the two two-way valves is connected between the outlet of the spray liquid collecting device (28) and the inlet of the water treatment device (3), and the other is connected between the liquid replenishing pipe (203) and the inlet of the water treatment device (3).

9. A control method for a heat exchange unit, characterized in that: A heat exchange unit as claimed in any one of claims 1 to 8, comprising: During the operation of the spray circuit (2), when the water treatment device (3) needs to be regenerated, the spray circuit (2) is switched to the second state so that the spray return liquid bypasses the liquid storage tank (22) for circulation until the regeneration of the water treatment device (3) is completed, and then the spray circuit (2) is switched to the first state.

10. The control method of the heat exchange unit according to claim 9, characterized in that: Also includes: When the conductivity of the spray liquid is greater than a preset conductivity, the liquid storage tank (22) is controlled to drain the liquid until the liquid level of the liquid storage tank (22) drops to a first preset liquid level, at which time the draining is stopped.

11. The control method of the heat exchange unit according to claim 9 or 10, characterized in that: Also includes: When the liquid level of the liquid storage tank (22) drops to a first preset liquid level, the spray circuit (2) is switched to the second state, so that the spray return liquid bypasses the liquid storage tank (22) for circulation, until the liquid level of the liquid storage tank (22) rises to a second preset liquid level, and the spray circuit (2) is switched to the first state.

Images