Integrated heat exchanger and heat pump unit

Abstract

The integrated heat exchanger comprises a first heat exchanger and a second heat exchanger which are integrated in the same shell, the first heat exchanger comprises an inner straight pipe and an outer spiral pipe, and the outer spiral pipe is arranged on the outer wall of the inner straight pipe in a winding mode; the inner straight pipe is provided with a refrigerant inlet pipe, the bottom of the inner straight pipe is sealed by a sealing plate, and the sealing plate is provided with a through hole; the second heat exchanger comprises a first refrigerant flow channel and a second refrigerant flow channel; a refrigerant inlet pipe is arranged at one end of the first refrigerant flow channel, penetrates through the through hole and extends by a certain distance. According to the arrangement mode, the economizer and the condenser are integrated together, the space of the heat pump unit can be effectively saved, the copper pipe cost of a refrigerant flow path pipeline is reduced, the energy loss is reduced, and the efficiency of the heat pump unit is improved; and meanwhile, the bottom of the refrigerant flow channel of the first heat exchanger has a certain liquid storage function, the circulation amount of the refrigerant can be adjusted when the load of the heat pump unit changes, and the stability and the operation efficiency of the heat pump unit are improved.

Description

Technical Field

[0001] This utility model relates to the field of heat pump component technology, and in particular to an integrated heat exchanger and heat pump unit. Background Technology

[0002] As an important system component of heat pump units, heat exchangers are widely used in heating, cooling and hot water supply.

[0003] Please see Figure 1 Existing technology involves connecting an economizer 70 after the condenser 30 to increase the subcooling of the refrigerant entering the evaporator 50 and reduce the discharge temperature of the compressor 10. This arrangement allows the medium-temperature liquid refrigerant from the condenser 30 to further exchange heat with the enthalpy-increasing refrigerant after entering the economizer 70, resulting in subcooling. The subcooled liquid refrigerant can then more effectively absorb heat when entering the evaporator 50, improving the system's energy efficiency. Meanwhile, the enthalpy-increasing refrigerant further evaporates after absorbing heat, increasing its evaporation temperature, which in turn reduces the discharge temperature of the compressor 10 and extends the compressor's service life.

[0004] Installing an economizer after the heat exchanger can recover waste heat from the system and further reduce the refrigerant temperature through heat exchange. This design not only improves the subcooling of the refrigerant but also reduces the heat load on the condenser, optimizing the operation of the entire system. However, this design occupies a large space and requires refrigerant flow piping to connect the condenser and the economizer, as well as the economizer and the evaporator. The numerous flow piping leads to heat loss and reduces energy efficiency; furthermore, a receiver-supply tank is needed to adjust the refrigerant circulation rate when the heat pump unit load changes. Utility Model Content

[0005] Based on this, the purpose of this utility model is to provide an integrated heat exchanger and heat pump unit, which helps to optimize the space of the heat pump unit, improve the performance of the heat pump unit, reduce energy loss, and reduce costs.

[0006] An integrated heat exchanger and heat pump unit includes a housing, within which the following components are arranged sequentially from top to bottom:

[0007] The first heat exchanger includes an inner straight tube and an outer spiral tube, the outer spiral tube being wound around the outer wall of the inner straight tube; the inner straight tube is provided with a refrigerant inlet pipe, the bottom of which is sealed by a sealing plate, the sealing plate having a through hole;

[0008] The second heat exchanger includes a first refrigerant channel and a second refrigerant channel; one end of the first refrigerant channel is provided with a refrigerant inlet pipe and the other end is provided with a refrigerant outlet pipe, wherein the refrigerant inlet pipe passes through a through hole and extends a certain distance; one end of the second refrigerant channel is provided with an enthalpy-increasing refrigerant inlet pipe and the other end is provided with an enthalpy-increasing refrigerant outlet pipe.

[0009] Furthermore, the second heat exchanger is a spiral plate heat exchanger, including a first refrigerant flow channel spiral plate and a second refrigerant flow channel spiral plate. The first refrigerant flow channel spiral plate and the second refrigerant flow channel spiral plate have a double spiral concentric nested structure, wherein the refrigerant inlet pipe is connected to the center of the first refrigerant flow channel spiral plate.

[0010] Furthermore, in a direction perpendicular to the double-helix concentric nested structure, an upper sealing plate is provided above the double-helix concentric nested structure, and a lower sealing plate is provided below the double-helix concentric nested structure.

[0011] Furthermore, a spacer column is also provided between the first refrigerant flow channel spiral plate and the second refrigerant flow channel spiral plate.

[0012] Furthermore, the inlet of the refrigerant inlet pipe is configured as an oblique cut inlet.

[0013] Furthermore, the shell includes a cover plate, a bottom plate, and side wall plates. The cover plate, bottom plate, and side wall plates together form a housing for accommodating the first heat exchanger and the second heat exchanger. A water inlet, a water outlet, and a liquid inlet are provided on the side wall plate at the corresponding position of the first heat exchanger, and a liquid outlet, an enthalpy-increasing refrigerant inlet, and an outlet are provided on the side wall plate at the corresponding position of the second heat exchanger.

[0014] Furthermore, the shell also includes a partition plate located between the cover plate and the bottom plate. The cover plate, the partition plate, and the side wall plate together form a first accommodating portion for accommodating the first heat exchanger, and the partition plate, the bottom plate, and the side wall plate together form a second accommodating portion for accommodating the second heat exchanger.

[0015] Furthermore, the first heat exchanger and the second heat exchanger are fixed inside the shell by welding.

[0016] Compared with the prior art, the integrated heat exchanger of this utility model has the following advantages:

[0017] 1) By sequentially arranging a shell-and-tube heat exchanger and a spiral heat exchanger from top to bottom within the same casing, the condenser and economizer are integrated together, effectively saving space in the heat pump unit, reducing the cost of copper pipes in the refrigerant flow path, reducing energy loss, and improving the efficiency of the heat pump unit.

[0018] 2) By sealing the bottom of the refrigerant flow channel in the shell-and-tube heat exchanger and extending the refrigerant inlet of the spiral heat exchanger through the bottom of the refrigerant flow channel of the shell-and-tube heat exchanger for a certain distance, the bottom of the refrigerant flow channel of the shell-and-tube heat exchanger has a certain liquid storage function, which can adjust the refrigerant circulation volume when the heat pump unit load changes, thereby improving the stability and operating efficiency of the heat pump unit.

[0019] Meanwhile, this utility model also provides a heat pump unit, including a compressor, a four-way valve, an integrated heat exchanger, a main electronic expansion valve, an auxiliary electronic expansion valve, an air-side heat exchanger, and a three-way valve connected to the main electronic expansion valve and the auxiliary electronic expansion valve through a refrigerant pipeline. The integrated heat exchanger is any of the integrated heat exchangers described above. The refrigerant inlet pipe of the first refrigerant flow channel is connected to the four-way valve, and the refrigerant outlet pipe is connected to the main electronic expansion valve. The enthalpy-increasing refrigerant inlet pipe of the second refrigerant flow channel is connected to the auxiliary electronic expansion valve, and the enthalpy-increasing refrigerant outlet pipe is connected to the intermediate pressure chamber of the compressor.

[0020] Compared with the prior art, the heat pump unit of this utility model has the same beneficial effects as the above-mentioned integrated heat exchanger and heat pump unit, and will not be repeated here.

[0021] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a heat pump unit using existing technology.

[0023] Figure 2 This is a schematic diagram of the heat pump unit structure of this utility model.

[0024] Figure 3 for Figure 2 A schematic diagram of the integrated heat exchanger in the image;

[0025] Figure 4 for Figure 3 A schematic diagram of the cross-section of a spiral plate heat exchanger. Detailed Implementation

[0026] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings of the embodiments thereof.

[0027] To address the issues of large space requirements and increased condenser flow path piping caused by separating the economizer and condenser in existing heat pump units, this invention proposes an integrated heat exchanger and a heat pump unit incorporating this integrated heat exchanger.

[0028] Please see Figure 2The heat pump unit of this utility model includes: a compressor 10, a four-way valve 20, an integrated heat exchanger 30, a main electronic expansion valve 40, an auxiliary electronic expansion valve 60, an air-side heat exchanger 50, a gas-liquid separator 80, and a three-way valve 70 connecting the main electronic expansion valve 40 and the auxiliary electronic expansion valve 60, as well as other auxiliary pipe fittings, all connected by refrigerant piping. During heating, the high-temperature, high-pressure refrigerant discharged from the compressor 10 flows through the four-way valve 20 to the integrated heat exchanger 30 for heat exchange with water, then with enthalpy-increasing refrigerant. After passing through the three-way valve 70, it can be divided into two refrigerant streams. One stream flows through the main electronic expansion valve 40 to the air-side heat exchanger 50 for heat exchange with air, then flows through the four-way valve 20 and the gas-liquid separator 80 before returning to the compressor 10's return port. The other stream flows through the auxiliary electronic expansion valve 60 back to the integrated heat exchanger 30 for enthalpy increase before flowing back to the compressor 10's intermediate-pressure chamber.

[0029] Please see Figure 3 The integrated heat exchanger 30 of this utility model includes a housing 31, and a first heat exchanger 32 and a second heat exchanger 33 arranged sequentially from top to bottom within the housing 31. High-temperature, high-pressure liquid refrigerant discharged from the compressor 10 flows into the first heat exchanger 32 to exchange heat with water, stores a portion of the liquid refrigerant, and then flows into the second heat exchanger 33 to exchange heat with enthalpy-increasing refrigerant before entering the main electronic expansion valve 40 for throttling.

[0030] The housing 31 includes a cover plate 311, a bottom plate 312, a partition plate 313, and a side wall plate 314, with the partition plate 313 located between the cover plate 311 and the bottom plate 312. The cover plate 311, partition plate 313, and side wall plate 314 together form a first accommodating portion for housing the first heat exchanger 32; the partition plate 313, bottom plate 312, and side wall plate 314 together form a second accommodating portion for housing the second heat exchanger 33. The first accommodating portion has an inlet A and an outlet B for water as the working fluid, and an inlet C for refrigerant. The second accommodating portion has an outlet D for refrigerant, and an inlet E and an outlet F for enthalpy-increasing refrigerant.

[0031] The first heat exchanger 32 includes an inner straight tube 321 and an outer spiral tube 322, with the outer spiral tube 322 wound around the outer wall of the inner straight tube 321.

[0032] The inner straight pipe 321 has a refrigerant inlet pipe at its upper part, and its bottom is sealed by a sealing plate 3212. The high-temperature and high-pressure liquid refrigerant discharged from the compressor 10 exhaust port enters the inner straight pipe 321 through the refrigerant inlet pipe and is stored at the bottom of the inner straight pipe 321. A through hole 3213 is opened in the middle of the sealing plate 3212 for refrigerant supply to the second heat exchanger 33.

[0033] One end of the outer spiral tube 322 extends out of the inlet A and connects to the external water inlet, while the other end of the outer spiral tube 322 extends out of the outlet B and connects to the outside.

[0034] The second heat exchanger 33 is a spiral heat exchanger, including a first refrigerant channel and a second refrigerant channel. One end of the first refrigerant channel has a refrigerant inlet pipe, and the other end has a refrigerant outlet pipe. The refrigerant inlet pipe passes through the through-hole 3213 at the bottom of the inner straight pipe 321 and extends for a certain distance. After receiving the refrigerant that exchanges heat with the water working fluid through the refrigerant inlet pipe, the first refrigerant channel exchanges heat with the enthalpy-increasing refrigerant and then connects to the main electronic expansion valve 40 through the refrigerant outlet pipe. Further, the inlet of the refrigerant inlet pipe is set as a beveled inlet. One end of the second refrigerant channel has an enthalpy-increasing refrigerant inlet pipe, and the other end has an enthalpy-increasing refrigerant outlet pipe. The second refrigerant channel receives the enthalpy-increasing refrigerant throttled by the auxiliary electronic expansion valve 60 through the enthalpy-increasing refrigerant inlet pipe and exchanges heat with the refrigerant, then delivers the enthalpy-increasing refrigerant to the intermediate pressure chamber of the compressor 10 through the enthalpy-increasing refrigerant outlet pipe.

[0035] In one embodiment, the second heat exchanger 33 is a spiral plate heat exchanger; please refer to [link / reference]. Figure 3 and Figure 4 It includes a first refrigerant flow channel spiral plate 331 and a second refrigerant flow channel spiral plate 332. The first refrigerant flow channel spiral plate 331 and the second refrigerant flow channel spiral plate 332 form a double-helix concentric nested structure, creating an inner spiral and an outer spiral. The distance between the first refrigerant flow channel spiral plate 331 and the second refrigerant flow channel spiral plate 332 is maintained by a spacer post. An upper sealing plate 333, a double-helix concentric nested structure, and a lower sealing plate 334 are sequentially arranged in a direction perpendicular to the double-helix concentric nested structure.

[0036] The first refrigerant flow channel spiral plate 331 has a refrigerant inlet pipe 3311 at its center. The refrigerant inlet pipe 3311 is inserted into the bottom of the inner straight pipe 321 after passing through the embedded through hole 3213 and extends a certain distance, so that the inner straight pipe 321 has a certain liquid storage function and the refrigerant flows into the first refrigerant flow channel spiral plate 331 through the refrigerant inlet pipe 3311 after the refrigerant is stored to a certain extent. The spiral tail of the first refrigerant flow channel spiral plate 331 has a refrigerant outlet pipe 3312, which is connected to the main electronic expansion valve 40 and delivers refrigerant to the main electronic expansion valve 40.

[0037] The center of the second refrigerant flow channel spiral plate 332 is provided with an enthalpy-increasing refrigerant inlet pipe 3321, which is connected to the auxiliary electronic expansion valve 60 to receive refrigerant throttled by the auxiliary electronic expansion valve 60; the spiral tail of the second refrigerant flow channel spiral plate 332 is provided with an enthalpy-increasing refrigerant outlet pipe 3322, which is connected to the intermediate pressure chamber of the compressor 10 to deliver enthalpy-increasing refrigerant to the compressor 10.

[0038] The first heat exchanger 32 and the second heat exchanger 33 are fixed inside the shell by welding.

[0039] Compared with the prior art, the integrated heat exchanger and heat pump unit of this utility model have the following advantages:

[0040] 1) By sequentially arranging a shell-and-tube heat exchanger and a spiral heat exchanger from top to bottom within the same casing, the condenser and economizer are integrated together, effectively saving space in the heat pump unit, reducing the cost of copper pipes in the refrigerant flow path, reducing energy loss, and improving the efficiency of the heat pump unit.

[0041] 2) By sealing the bottom of the refrigerant flow channel in the shell-and-tube heat exchanger and extending the refrigerant inlet of the spiral heat exchanger through the bottom of the refrigerant flow channel of the shell-and-tube heat exchanger for a certain distance, the bottom of the refrigerant flow channel of the shell-and-tube heat exchanger has a certain liquid storage function, which can adjust the refrigerant circulation volume when the heat pump unit load changes, thereby improving the stability and operating efficiency of the heat pump unit.

[0042] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments and claims of this application are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that, unless otherwise stated, “a plurality” and “several” refer to two or more; “and / or” refers to and includes any or all possible combinations of one or more associated listed items; “first,” “second,” “third,” etc., are used only to distinguish and not to describe a particular order or sequence, nor should they be construed as indicating or implying relative importance. When the above description relates to drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. In the description of this application, those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model, and this utility model also intends to include these modifications and variations.

Claims

1. An integrated heat exchanger, comprising a housing, characterized in that, The following are arranged sequentially from top to bottom inside the casing: The first heat exchanger includes an inner straight tube and an outer spiral tube, the outer spiral tube being wound around the outer wall of the inner straight tube; the inner straight tube is provided with a refrigerant inlet pipe, the bottom of which is sealed by a sealing plate, the sealing plate having a through hole; The second heat exchanger includes a first refrigerant channel and a second refrigerant channel; one end of the first refrigerant channel is provided with a refrigerant inlet pipe and the other end is provided with a refrigerant outlet pipe, wherein the refrigerant inlet pipe passes through a through hole and extends a certain distance; one end of the second refrigerant channel is provided with an enthalpy-increasing refrigerant inlet pipe and the other end is provided with an enthalpy-increasing refrigerant outlet pipe.

2. The integrated heat exchanger according to claim 1, characterized in that, The second heat exchanger is a spiral plate heat exchanger, including a first refrigerant flow channel spiral plate and a second refrigerant flow channel spiral plate. The first refrigerant flow channel spiral plate and the second refrigerant flow channel spiral plate have a double spiral concentric nested structure, wherein the refrigerant inlet pipe is connected to the center of the first refrigerant flow channel spiral plate.

3. The integrated heat exchanger according to claim 2, characterized in that, In a direction perpendicular to the double-helix concentric nested structure, an upper sealing plate is provided above the double-helix concentric nested structure, and a lower sealing plate is provided below the double-helix concentric nested structure.

4. The integrated heat exchanger according to claim 3, characterized in that, A spacer column is also provided between the first refrigerant flow channel spiral plate and the second refrigerant flow channel spiral plate.

5. The integrated heat exchanger according to claim 1, characterized in that, The refrigerant inlet pipe is designed with an angled inlet.

6. The integrated heat exchanger according to any one of claims 1 to 5, characterized in that, The shell includes a cover plate, a bottom plate, and side wall plates. The cover plate, bottom plate, and side wall plates together form a housing for accommodating the first heat exchanger and the second heat exchanger. A water inlet, a water outlet, and a liquid inlet are provided on the side wall plate at the corresponding position of the first heat exchanger. A liquid outlet, an enthalpy-increasing refrigerant inlet, and an outlet are provided on the side wall plate at the corresponding position of the second heat exchanger.

7. The integrated heat exchanger according to claim 6, characterized in that, The shell also includes a partition plate located between the cover plate and the bottom plate. The cover plate, the partition plate, and the side wall plate together form a first accommodating part for accommodating the first heat exchanger, and the partition plate, the bottom plate, and the side wall plate together form a second accommodating part for accommodating the second heat exchanger.

8. The integrated heat exchanger according to claim 1, characterized in that, The first heat exchanger and the second heat exchanger are fixed inside the shell by welding.

9. A heat pump unit, comprising a compressor, a four-way valve, an integrated heat exchanger, a main electronic expansion valve, an auxiliary electronic expansion valve, an air-side heat exchanger, and a three-way valve connecting the main electronic expansion valve and the auxiliary electronic expansion valve, characterized in that, The integrated heat exchanger is the integrated heat exchanger according to any one of claims 1-8, wherein the refrigerant inlet pipe of the first refrigerant flow channel is connected to a four-way valve, and the refrigerant outlet pipe is connected to the main electronic expansion valve; the enthalpy-increasing refrigerant inlet pipe of the second refrigerant flow channel is connected to an auxiliary electronic expansion valve, and the enthalpy-increasing refrigerant outlet pipe is connected to the intermediate pressure chamber of the compressor.

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