Heat pump air conditioner pressure release valve resistant to high temperature and high pressure

Abstract

The utility model relates to a heat pump air conditioner pressure release valve resistant to high temperature and high pressure, which aims at solving the problem that an existing pressure release valve cannot adapt to high-temperature and high-pressure environments and achieves product functions through unique structural design. For external leakage sealing, a pressure release valve shell material having enough hardness difference with a compressor shell is selected, the end face of the pressure release valve shell material is provided with protruding ring teeth, and the ring teeth are extruded and embedded into an end cover of the compressor for sealing through screwing installation. In the aspect of internal leakage sealing, the sealing seat made of a non-metal material is adopted to extrude the inner cone of the shell with small force, and meanwhile, the sealing ball extrudes the inner conical surface of the sealing seat. The sealing seat pressing block is screwed through threads, the spring compression amount is adjusted, and the sealing stability is further enhanced. Compared with the prior art, the utility model effectively solves the problem of leakage caused by creep deformation of a sealing pressing block material at high temperature, improves the sealing performance, ensures stable work in high-pressure, high-temperature and vibration environments, and obviously improves the overall performance and safety of a heat pump air-conditioning system.

Description

TECHNICAL FIELD

[0001] The utility model relates to a heat pump air conditioner pressure relief valve, especially a high-temperature and high-pressure resistant heat pump air conditioner pressure relief valve. BACKGROUND

[0002] The new energy electric vehicle requires the increase of the endurance mileage, and the heat management plays a key role in the popularization of urban electric traffic, the prolongation of battery life, the improvement of endurance capacity and the improvement of driving system performance.

[0003] The heat pump air conditioner is an effective solution for the heating of the pure electric vehicle. In the case that the power battery has no breakthrough progress, the heat pump air conditioner is one of the few feasible technologies, and the coefficient of performance is 2-3 times higher than that of the PTC heating, which can effectively prolong the endurance mileage by more than 20%.

[0004] At present, the pressure of the traditional air conditioning system is 13bar-17bar, and the low pressure 1bar-3bar belongs to the low pressure category. However, due to the high GWP, it has been listed in the elimination procedure. Therefore, R134a is only used as a substitute in the transition to an environmentally friendly product, and the complete elimination is only a matter of time. The heat pump air conditioner adopts R744 (CO2) carbon dioxide refrigerant, and the system pressure is 170bar in high pressure and 130bar in low pressure, which belongs to the high pressure category.

[0005] Therefore, the traditional air conditioner pressure relief valve cannot meet the requirement of pressure relief when the system pressure reaches 130-170bar. UTILITY MODEL CONTENT

[0006] The utility model discloses a high-temperature and high-pressure resistant heat pump air conditioner pressure relief valve, which effectively solves the leakage problem caused by the creep of the sealing block material at high temperature, improves the sealing performance, ensures stable work in the high-pressure, high-temperature and vibration environment, and significantly improves the overall performance and safety of the heat pump air conditioning system.

[0007] The utility model discloses a high-temperature and high-pressure resistant heat pump air conditioner pressure relief valve, which effectively solves the leakage problem caused by the creep of the sealing block material at high temperature, improves the sealing performance, ensures stable work in the high-pressure, high-temperature and vibration environment, and significantly improves the overall performance and safety of the heat pump air conditioning system.

[0008] The utility model provides a high-temperature and high-pressure resistant heat pump air conditioner pressure relief valve, including the pressure relief valve casing being equipped with the chamber, be equipped with the sealing ball, slider, spring in the chamber of pressure relief valve casing, the slider can move and install in the chamber, be equipped with the exhaust hole in the slider, the one end of spring is with the slider is opposite and connects, the other end of spring is limited by the limiting piece,

[0009] The sealing kit is composed of a sealing seat pressing block and a sealing seat which are pre-pressed and assembled together, the sealing seat pressing block is screwed with the inner wall of the chamber of the pressure relief valve shell, and the sealing seat comprises a first columnar section, a conical sealing section and a second columnar section which are integrally formed;

[0010] The top of the first columnar section can abut against the sealing ball for sealing;

[0011] The lower surface of the second columnar section is in interference fit with the top of the sealing seat pressing block, and the axial extrusion force provided by the sealing seat pressing block causes the outer conical surface of the conical sealing section to be extruded and sealed with the inner wall of the chamber of the pressure relief valve shell.

[0012] Further, the sealing seat pressing block comprises a sealing seat pressing block main body and a protruding part provided at the end of the sealing seat pressing block main body, and the diameter of the protruding part is smaller than that of the sealing seat pressing block main body;

[0013] The sealing seat pressing block main body is provided with external threads.

[0014] Further, the lower surface of the second columnar section is provided with a butt joint groove, and the protruding part is in interference fit with the butt joint groove.

[0015] Further, the chamber of the pressure relief valve shell is provided with a first straight section, a conical surface section, a second straight section and a third straight section which are matched with the sealing kit and connected in sequence;

[0016] The inner wall surface of the conical surface section is extruded and sealed with the outer wall surface of the conical sealing section.

[0017] Further, the inner wall surface of the first straight section is in clearance fit with the outer wall surface of the first columnar section;

[0018] The inner wall surface of the second straight section is in clearance fit with the outer wall surface of the second columnar section.

[0019] Further, the third straight section is provided with internal threads which are matched with the external threads on the sealing seat pressing block main body.

[0020] Further, the end surface of the pressure relief valve shell for mounting insertion into the heat pump air conditioner compressor is provided with a protruding ring tooth;

[0021] The outer surface of the pressure relief valve shell is provided with external threads, the pressure relief valve shell is fastened in the heat pump air conditioner compressor through the external threads, and the protruding ring tooth is extruded and sealed with the counterpart.

[0022] Further, the material of the sealing seat is plastic.

[0023] Further, the plastic is one of polytetrafluoroethylene, polyvinylidene fluoride, polyphenylene sulfide, polyether ether ketone, polysulfone, polyaryl sulfone.

[0024] Further, the material of the sealing seat pressing block is one of stainless steel, aluminum alloy, titanium alloy, copper alloy.

[0025] Compared with the prior art, the utility model has the following beneficial effects:

[0026] 1) In the internal leakage sealing aspect, the utility model discloses a unique advantage through the pre-pressing of the sealing seat pressing block and the sealing seat assembled together, and the sealing seat of nonmetal material is extruded and sealed with the outer conical surface of the shell with relatively small force, and at the same time, the inner conical surface of the sealing seat is extruded and sealed by cooperating with the sealing ball, so that the high -efficient internal sealing effect is achieved. This design not only optimizes the sealing performance, but also reduces the damage risk of the internal structure caused by excessive pressure under the working temperature. In addition, the sealing seat is further enhanced by the sealing seat pressing block to give the sealing seat thrust, the stability and reliability of the internal sealing are further enhanced, and the overall performance and safety of the heat pump air conditioning system are greatly improved.

[0027] 2) The heat pump air conditioner pressure relief valve of the utility model has remarkable improvement in sealing performance. The hard sealing mode of mutual abutting of metal materials is adopted for the external leakage sealing, the problem of sealing leakage caused by the decrease of mechanical properties of materials due to creep under high temperature environment is solved. The convex ring tooth is arranged on the end face of the shell, and when the shell is tightly installed with the compressor shell, the end convex ring tooth can be stably extruded and embedded into the compressor end cover, reliable external sealing is realized, and the leakage of external medium is effectively prevented. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a structure schematic view of the heat pump air conditioner pressure relief valve with high temperature resistance and high pressure resistance in the utility model.

[0029] In the drawing: 1, pressure relief valve shell, 2, limiting piece, 3, spring, 4, sliding block, 5, sealing ball, 6, sealing seat, 61, first column type section, 62, conical frustum sealing section, 63, second column type section, 7, sealing seat pressing block, 71, convex part, 72, sealing seat pressing block main body, 8, convex ring tooth, 9, conical section. DETAILED DESCRIPTION

[0030] The utility model will be described in detail below in combination with the drawings and specific embodiments. In the technical scheme, if the preparation means, materials, structures or component ratio features are not explicitly stated, they are regarded as common technical features disclosed in the prior art.

[0031] Example 1

[0032] The high-temperature and high-pressure resistant heat pump air conditioner pressure relief valve in the embodiment comprises a pressure relief valve shell body 1 provided with a cavity, a sealing ball 5, a sliding block 4 and a spring 3 are arranged in the cavity of the pressure relief valve shell body 1, the sliding block 4 is movably arranged in the cavity, an exhaust hole is arranged in the sliding block 4, one end of the spring 3 is in abutment with the sliding block 4, and the other end of the spring 3 is limited by a limiting piece 2, a sealing sleeve assembly is arranged on the pressure relief valve shell body 1 and is arranged to be inserted into one end of a heat pump air conditioner compressor, the sealing sleeve assembly comprises a sealing seat pressing block 7 and a sealing seat 6 which are pre-pressed and assembled together, the sealing seat pressing block 7 is screwed with the inner wall of the cavity of the pressure relief valve shell body 1, and the sealing seat 6 comprises a first columnar section 61, a conical frustum sealing section 62 and a second columnar section 63 which are integrally formed, the top of the first columnar section 61 can be in abutment and sealing with the sealing ball 5, the lower surface of the second columnar section 63 is in interference fit with the top of the sealing seat pressing block 7, and the axial extrusion force provided by the sealing seat pressing block 7 causes the outer conical surface of the conical frustum sealing section 62 to be extrusion sealed with the inner wall of the cavity of the pressure relief valve shell body 1.

[0033] The sealing seat pressing block 7 comprises a sealing seat pressing block main body 72 and a protruding part 71 arranged at the end of the sealing seat pressing block main body 72, the diameter of the protruding part 71 is smaller than that of the sealing seat pressing block main body 72, and an external thread is arranged on the sealing seat pressing block main body 72.

[0034] The lower surface of the second columnar section 63 is provided with a butt joint groove, and the protruding part 71 is in interference fit with the butt joint groove.

[0035] The cavity of the pressure relief valve shell body 1 is provided with a first straight section, a conical surface section 9, a second straight section and a third straight section which are matched with the sealing sleeve assembly and are sequentially connected, and the inner wall surface of the conical surface section 9 is extrusion sealed with the outer wall surface of the conical frustum sealing section 62.

[0036] The inner wall surface of the first straight section is in clearance fit with the outer wall surface of the first columnar section 61, the inner wall surface of the second straight section is in clearance fit with the outer wall surface of the second columnar section 63, and an internal thread is arranged on the third straight section and is matched with the external thread on the sealing seat pressing block main body 72.

[0037] The end surface of the pressure relief valve shell body 1 for installing and inserting into the heat pump air conditioner compressor is provided with a convex ring tooth 8, an external thread is arranged on the outer surface of the pressure relief valve shell body 1, the pressure relief valve shell body 1 is fastened in the heat pump air conditioner compressor through the external thread, and the convex ring tooth 8 is extrusion sealed with a counterpart.

[0038] When the materials are specifically selected, the material of the sealing seat 6 is plastic, and the plastic is one of polytetrafluoroethylene, polyvinylidene fluoride, polyphenylene sulfide, polyether ether ketone, polysulfone and polyaryl sulfone. The material of the sealing seat pressing block 7 is one of stainless steel, aluminum alloy, titanium alloy and copper alloy.

[0039] In particular implementation, the high-temperature and high-pressure resistant heat pump air conditioner pressure relief valve in the embodiment can be used for R744 heat pump air conditioner pressure relief valve sealing structure.

[0040] External leakage will cause the refrigerant in the air conditioning system to decrease, causing the system components to be damaged and fail due to lack of refrigerant. Sealing area: sealing seat 6 and electronic valve or compressor body. Internal leakage is: when the pressure of the electronic valve or compressor system reaches a preset pressure, such as 130 bar, 170 bar, pressure relief is performed to protect the system safety.

[0041] Implementation of external leakage sealing: the pressure relief valve housing 1 is tightened by thread, and the housing end face protruding ring tooth 8 is sealed by extrusion with the opposite piece on the heat pump air conditioner compressor.

[0042] Implementation of internal leakage sealing:

[0043] 1. The sealing seat pressure block 7 is tightened by thread to give the sealing seat 6 a thrust, and the outer taper surface of the sealing seat 6 is sealed by extrusion with the inner taper surface of the pressure relief valve housing 1.

[0044] 2. The sliding block is given a thrust by adjusting the spring compression amount, and the sliding block pushes the sealing ball to extrude the sealing seat taper surface for sealing.

[0045] In the technical solution, the hardness difference cooperation is:

[0046] a) Compressor housing (soft) - pressure relief valve housing (hard): the protruding ring tooth 8 on the end face of the pressure relief valve housing 1 is extruded and embedded into the compressor housing for sealing;

[0047] b) Sealing seat (soft) - pressure relief valve housing (hard): the outer taper surface of the sealing seat 6 is extruded and sealed with the inner taper surface of the pressure relief valve housing 1;

[0048] c) Sealing seat (soft) - sealing ball (hard): the inner taper surface of the sealing seat 6 is extruded and sealed with the sealing ball 5.

[0049] In particular assembly, the end protrusion 71 of the sealing seat pressure block 7 is pressed into the abutting groove of the sealing seat 6, and the two are preassembled. The preassembled sealing seat 6 and sealing seat pressure block 7 form a sealing assembly, which is installed in the pressure relief valve housing 1. The sealing seat pressure block 7 is screwed into the pressure relief valve housing 1 by thread, and a suitable tightening torque is adopted. The outer taper surface of the sealing seat 6, i.e. the conical frustum sealing section 62, is extruded and sealed with the inner taper surface of the pressure relief valve housing 1. The sealing ball 5 is installed, and the sealing ball 5 is attached to the inner taper surface of the sealing seat 6 to form a pressure-resistant seal.

[0050] The inner conical surface of the sliding block 4 presses the sealing ball 5 to form a counter-pressure seal. The spring 3 is placed in the pressure relief valve housing 1 and vertically falls into the mounting hole of the sliding block 4. The pressure regulating nut 2 is screwed into the pressure relief valve housing 1, and by adjusting the screwing depth of the pressure regulating nut 2, the pressure applied by the sliding block 4 to the sealing ball 5 on the conical surface of the sealing seat 6 is adjusted to seal, and the force applied is the pressure relief opening pressure. The pressure relief valve housing 1 is screwed into the compressor housing through threads, and a suitable tightening torque is adopted to make the protruding ring teeth 8 on the end face of the pressure relief valve housing 1 extrude and embed into the compressor housing to seal.

[0051] Comparative Example 1

[0052] The technical solutions of CN214743587U and CN218000534U are similar in the structures of the pressure relief valve housing, the adjusting sliding block, the spring, the pressure regulating nut and the sealing ball, and the pressure relief principles are similar. However, the sealing seat structure of CN214743587U and CN218000534U is integrated, and the integrated sealing seat structure is made of plastic material. The integrated sealing seat structure needs to be in contact with the counterpart on the compressor and resist 180° temperature, and at the same time, the integrated sealing seat structure needs to be screwed on the inner wall of the pressure relief valve housing to provide axial pressure to the sealing ball, so that the integrated sealing seat structure is prone to deformation under working conditions and is prone to function damage or leakage.

[0053] The sealing seat pressure block 7 and the sealing seat 6 pre-pressed and assembled together in the embodiment 1 of the utility model have unique advantages. The sealing seat made of non-metallic material is extruded and sealed with the outer conical surface of the housing by relatively small force, and at the same time, the sealing ball is extruded and sealed with the inner conical surface of the sealing seat, so that high-efficiency internal sealing effect is achieved. This design not only optimizes the sealing performance, but also reduces the damage risk of the internal structure caused by excessive pressure under working temperature. In addition, the sealing seat is given a pushing force by the sealing seat pressure block, so that the stability and reliability of the internal sealing are further enhanced, so that the pressure relief valve can still accurately and stably play a role in a high-pressure, high-temperature and vibration environment, and the overall performance and safety of the heat pump air conditioning system are greatly improved. The protruding ring teeth are arranged on the end face of the housing, and when the housing is tightly installed with the compressor housing, the end protruding ring teeth can be stably extruded and embedded into the compressor end cover to realize reliable external sealing and effectively prevent external medium leakage.

[0054] Verification Example 1

[0055] This verification example is an alternating pressure test on the high-temperature and high-pressure resistant heat pump air conditioning pressure relief valve in the embodiment 1.

[0056] Technical conditions:

[0057] Test pressure: Pmin 5.0 MPa ~ Pmax 14.5 MPa, i.e. the pressure relief valve in the heat pump air conditioner in Example 1 is fixed on the test bench, and the end installed in the heat pump air conditioner compressor is tested by applying pressure in the above range.

[0058] Pressure cycle: 150,000 times.

[0059] Medium temperature: (180 ± 2) °C.

[0060] Test medium: refrigeration compressor oil, viscosity: (5 to 6) mm 2 / s at 100 °C.

[0061] Test curve (sine or trapezoidal): frequency 0.5 Hz ~ 1 Hz.

[0062] Example 1 is tested in parallel using 3 heat pump air conditioner pressure relief valves, and the test results are shown in the table below:

[0063]

[0064] Example 2

[0065] This verification example is an alternating temperature test on the high temperature and high pressure resistant heat pump air conditioner pressure relief valve in Example 1.

[0066] Technical conditions:

[0067] Test pressure: 14.5 MPa

[0068] Temperature variation interval: -30 °C ~ +175 °C, i.e. the pressure relief valve in the heat pump air conditioner in Example 1 is fixed on the test bench, and the end installed in the heat pump air conditioner compressor is tested by applying temperature in the above range.

[0069] Rising and falling rate: 1 K / min.

[0070] Hold for 30 minutes at minimum / maximum.

[0071] Duration: 460 minutes (30-200-30-200).

[0072] Total time: 77 hours.

[0073] Example 2 is tested in parallel using 3 heat pump air conditioner pressure relief valves, and the test results are shown in the table below:

[0074]

[0075] The above description of the embodiments is to facilitate the ordinary skilled in the art to understand and use the utility model. The person skilled in the art can obviously easily make various modifications to these embodiments, and the general principles described herein are applied to other embodiments without the need for creative labor. Therefore, the utility model is not limited to the above embodiments, and the improvements and modifications made by the person skilled in the art according to the disclosure of the utility model without departing from the scope of the utility model should be within the protection scope of the utility model.

Claims

1. A high-temperature and high-pressure resistant heat pump air conditioner pressure relief valve, comprising a pressure relief valve shell (1) provided with a cavity, a sealing ball (5), a sliding block (4) and a spring (3) are arranged in the cavity of the pressure relief valve shell (1), the sliding block (4) is movably arranged in the cavity, the sliding block (4) is provided with an exhaust through hole, one end of the spring (3) is in abutment with the sliding block (4), and the other end of the spring (3) is limited by a limiting piece (2), characterized in that, a sealing sleeve is arranged on the pressure relief valve shell (1) for being inserted into one end of a heat pump air conditioner compressor, the sealing sleeve comprises a sealing seat pressing block (7) and a sealing seat (6) which are pre-pressed and assembled together, the sealing seat pressing block (7) is screwed with the inner wall of the cavity of the pressure relief valve shell (1), and the sealing seat (6) comprises a first columnar section (61), a conical frustum sealing section (62) and a second columnar section (63) which are integrally formed. The top of the first columnar section (61) can abut against and seal the sealing ball (5). The lower surface of the second columnar section (63) is in interference fit with the top of the sealing seat pressing block (7), and the axial extrusion force provided by the sealing seat pressing block (7) causes the outer conical surface of the conical frustum sealing section (62) to be extrusion sealed with the inner wall of the cavity of the pressure relief valve shell (1).

2. The high-temperature and high-pressure resistant heat pump air conditioner pressure relief valve according to claim 1, characterized in that, The sealing seat pressing block (7) comprises a sealing seat pressing block main body (72) and a protruding portion (71) arranged at the end of the sealing seat pressing block main body (72), and the diameter of the protruding portion (71) is smaller than that of the sealing seat pressing block main body (72). An external thread is arranged on the sealing seat pressing block main body (72).

3. The high-temperature and high-pressure resistant heat pump air conditioner pressure relief valve according to claim 2, characterized in that, The lower surface of the second columnar section (63) is provided with a butt joint groove, and the protruding portion (71) is in interference fit with the butt joint groove.

4. The high-temperature and high-pressure resistant heat pump air conditioner pressure relief valve according to claim 2, characterized in that, A first straight section, a conical surface section (9), a second straight section and a third straight section which are matched with the sealing sleeve and are sequentially connected are arranged in the cavity of the pressure relief valve shell (1). The inner wall surface of the conical surface section (9) is extrusion sealed with the outer wall surface of the conical frustum sealing section (62).

5. The high-temperature and high-pressure resistant heat pump air conditioning pressure relief valve according to claim 4, characterized in that, The inner wall surface of the first straight section is in clearance fit with the outer wall surface of the first columnar section (61). The inner wall surface of the second straight section is in clearance fit with the outer wall surface of the second columnar section (63).

6. The high-temperature and high-pressure resistant heat pump air conditioning pressure relief valve according to claim 4, characterized in that, An internal thread is arranged on the third straight section, and the internal thread is matched with the external thread on the sealing seat pressing block main body (72).

7. The high-temperature and high-pressure resistant heat pump air conditioning pressure relief valve according to claim 4, characterized in that, A protruding ring tooth (8) is arranged on the end surface of the pressure relief valve shell (1) for being inserted into the heat pump air conditioner compressor. An external thread is arranged on the outer surface of the pressure relief valve shell (1), the pressure relief valve shell (1) is fastened in the heat pump air conditioner compressor through the external thread, and the protruding ring tooth (8) is extrusion sealed with a counterpart.

8. The high-temperature and high-pressure resistant heat pump air conditioner pressure relief valve according to claim 1, characterized in that, The material of the sealing seat (6) is plastic.

9. The high-temperature and high-pressure resistant heat pump air conditioning pressure relief valve according to claim 8, characterized in that, The plastic is one of polytetrafluoroethylene, polyvinylidene fluoride, polyphenylene sulfide, polyether ether ketone, polysulfone and polyaryl sulfone.

10. The high-temperature and high-pressure resistant heat pump air conditioning pressure relief valve according to claim 1, characterized in that, The material of the sealing seat pressing block (7) is one of stainless steel, aluminum alloy, titanium alloy and copper alloy.

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